View W541C250_201308.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

PRELIMINARY
W541C250
4-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W541C250 is fully compatible with W741C250 in terms of pin assignment and IC function.. It is a high-performance 4-bit microcontroller (C) that provides an LCD driver. The device contains a 4-bit ALU, two 8-bit timers, a divider, a 24 x 4 LCD driver, and five 4-bit I/O ports (including 1 output port for LED driving). There are also five interrupt sources and 8-level subroutine nesting for interrupt applications. The W541C250 operates on low voltage and very low current and has two power reduction modes, hold mode and stop mode, which help to minimize power dissipation. The W541C250 is suitable for remote controllers, watches and clocks, multiple I/O products, keyboard controllers, speech synthesis LSI controllers, and other products.
FEATURES
* Operating voltage: 2.4 ~ 5.5V (LCD drive voltage: 3.0V, or 4.5V) * Single system clock
- Oscillation frequency up to 4 MHz , Crystal or RC oscillator is selected by mask code option , - High-frequency (400 KHz to 4 MHz) or low-frequency (32.768 KHz) oscillation is delected by mask code option
* Memory
-2048 x 16 bit program ROM (including 2K x 4 bit look-up table) -128 x 4 bit data RAM (including 16 working registers) -24 x 4 LCD data RAM
* 21 input/output pins
-Ports for input only: 2 ports/8 pins -Input/output ports: 2 ports/8 pins -Port for output only: 1 port /4 pins (high sink current to drive LEDs) -MFP output pin: 1 pin (MFP)
* Power-down mode
-
Hold function: no operation (except for oscillator) Stop function: no operation (including main clock) -Three internal interrupts (Divider 0, Timer 0, Timer 1) -Two external interrupt (Port RC and INT pin)
* Five types of interrupts
* LCD driver output
-24 segment x 4 common -Static, 1/2 duty (1/2 bias), 1/3 duty (1/2 or 1/3 bias), 1/4 duty (1/3 bias) driving mode can be selected -LCD driver output pins can be used as DC output ports; selectable by code option
-1-
Publication Release Date: Feb 2002 Revision A2
W541C250
* MFP output pin
-Output is software selectable as modulating or nonmodulating frequency -Works as frequency output specified by Timer 1 * Built-in 14-bit clock frequency divider circuit * Two built-in 8-bit programmable countdown timers -Timer 0: one of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected -Timer 1: includes an auto-reload function; and one of two internal clock frequencies (FOSC or FOSC/64) can be selected or falling edge of pin RC.0 can be selected (output through MFP pin)
* Built-in 18/14-bit watchdog timer selectable for system reset * Powerful instruction set: 115 instructions * 8-level subroutine (include interrupt) nesting * Up to 1 S instruction cycle (with 4 MHz operating frequency) * Packaged in 64-pin QFP
BLOCK DIAGRAM
SEG0 to SEG23 COM0 to COM3 VDD1 to 3 DH1 to 2
RAM (128*4)
LCD DRIVER
PORT RA ROM (2048*16)
(look_up table 2K*4)
+1(+2)
RA0 to 3
ACC PORT RB RB0 to 3
ALU
PORT RD PC Central Control Unit STACK (8 Levels)
IEF HCF PSR0 HEF EVF PR PEF SEF MR1
RD0 to 3
PORT RC
RC0 to 3
PORT RE
RE0 to 3
.
.
.
Timer 0 (8 Bit)
Timer 1 (8 Bit)
Modulation Frequency Pulse
SEL
MUX
MFP
VDD Watchdog Timer (4 Bit) Divider 0 (14 Bit) VSS Timing Generator INT RES
XIN
XOUT
-2-
Publication Release Date: Feb 2002 Revision A2
W541C250
PIN CONFIGURATION
SSSSS X RM/ I AFN 0PT VVVEEEEE / XOV DDDDDGGGGG R EI UDNNHHDDD22221 SNTDCC1212332109
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 RA1 RA2 RA3 RB0 RB1 RB2 RB3 RC0 RC1 RC2 RC3 RD0 RD1 52 53 54 55 56 57 58 59 60 61 62 63 64 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 32 31 30 29 28 27 26 25 24 23 22 21 20 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6
RRRRRRVNNC DDEEEESCCO 230123S M 3
C O M 2
C O M 1
C O M 0
S E G 0
S E G 1
S E G 2
S E G 3
S E G 4
S E G 5
-3-
Publication Release Date: Feb 2002 Revision A2
W541C250
PAD DESCRIPTION
SYMBOL XIN I/O I FUNCTION Input pin for oscillator. Connected to crystal or resistor to generate system clock by code option. External 15~20pF capacitor uses to get accurate freq in crystal mode. Output pin for oscillator. Connected to crystal or resistor to generate system clock by code option. 20PF capacitor is built in internal for crystal mode. Input/Output port. Input/output mode specified by port mode 1 register (PM1). Input/Output port. Input/output mode specified by port mode 2 register (PM2). 4-bit port for input only. Each pin has an independent interrupt capability. 4-bit port for input only. Output port only. This port provides high sink current to drive LEDs. Output pin only. This pin can output modulating or nonmodulating frequency, or Timer 1 clock output specified by mode register 1 (MR1). External interrupt pin with pull-high resistor. System reset pin with pull-high resistor. LCD segment output pins. Can also be used as DC output ports specified by code option. LCD common signal output pins.
Static COM0 COM1 COM2 COM3 Used Not Used Not Used Not Used 1/2 Duty Used Used Not Used Not Used 1/3 Duty Used Used Used Not Used 1/4 Duty Used Used Used Used
XOUT
O
RA0-RA3 RB0-RB3 RC0-RC3 RD0-RD3 RE0-RE3
I/O I/O I I O
MFP
INT
RES
O I I O O
SEG0-SEG23 COM0-COM3
The LCD alternating frequency can be selected by code option. DH1, DH2 VDD1, VDD2 VDD3 VDD VSS I I I I Connection terminals for voltage doubler (halver) capacitor. Positive (+) supply voltage terminal. Refer to Functional Description. Positive power supply (+). Negative power supply (-).
-4-
Publication Release Date: Feb 2002 Revision A2
W541C250
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage to Ground Potential Applied Input/Output Voltage Power Dissipation Ambient Operating Temperature Storage Temperature RATING -0.3 to +7.0 -0.3 to +7.0 120 0 to +70 -55 to +150 UNIT V V mW C C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.
DC CHARACTERISTICS
(VDD-VSS = 3.0V, FOSC. = 32.768 KHz, TA = 25 C; unless otherwise specified)
PARAMETER Op. Voltage Op. Current (Crystal type) Op. Current (RC type) Hold Current (Crystal type) Hold Current (RC type) Stop Current (Crystal type) Stop Current (RC type) Input Low Voltage Input High Voltage MFP Output Low Voltage MFP Output High Voltage Port RA, RB Output Low Voltage Port RA, RB Output high Voltage LCD Supply Current SEG0-SEG23 Sink Current (work as LCD output pins) SEG0-SEG23 Drive Current (work as LCD output pins)
SYM. VDD IOP1 IOP2 IHM1 IHM2 ISM1 ISM2 VIL VIH VML VMH VABL VABH ILCD IOL IOH
CONDITIONS No load (Ext-V) No load (Ext-V) Hold mode No load (Ext-V) Hold mode No load (Ext-V) Stop mode No load (Ext-V) Stop mode No load (Ext-V) IOL = 3.5 mA IOH = -3.5 mA IOL = 2.0 mA IOH = -2.0 mA All Seg. On VOL = 0.4V VLCD = 0.0V VOH = 2.4V VLCD = 3.0V
MIN. 2.4 VSS 0.7 VDD 2.4 2.4 0.4 -0.3
TYP. 0.1 0.1 -
MAX. 5.5 20 65 6 40 2 2 0.3 VDD VDD 0.4 0.4 10 -
UNIT V A A A A A A V V V V V V A A A
-5-
Publication Release Date: Feb 2002 Revision A2
W541C250
DC Characteristics, continued
PARAMETER SEG0-SEG23 Output Low Voltage (work as DC output pins) SEG0-SEG23 Output High Voltage (work as DC output pins) Port RE Sink Current Port RE Source Current Pull-up Resistor
INT Pull-up Resistor RES Pull-up Resistor
SYM. VSL VSH IEL IEH RCD RINT RRES
CONDITIONS IOL = 0.6 mA IOH = -0.3 A VOL = 0.9V VOH = 2.4V Port RC, RD -
MIN. 2.4 9 -0.4 100 50 20
TYP. -1.2 350 250 100
MAX. 0.4 1000 1000 500
UNIT V V mA mA K K K
AC CHARACTERISTICS
(VDD-VSS = 3V, TA = 25 C; unless otherwise specified) PARAMETER SYM. CONDITIONS RC type Op. Frequency FOSC Crystal type 1 (Option low-speed type) Crystal type 2 (Option high-speed type) Instruction Cycle Time Reset Active Width Interrupt Active Width TI TRAW TIAW One machine cycle FOSC = 32.768 KHz FOSC = 32.768 KHz MIN. 400 1 1 TYP. 32.768 4/FOSC MAX. 4000 2000 mS S S KHz UNIT
-6-
Publication Release Date: Feb 2002 Revision A2
W541C250
TYPICAL APPLICATION CIRCUIT
Vcc
VDD RA0 Output Signal RA3 RB0 RB1 RB2 RB3 RC0 RC1 RC2 RC3 COM3 SEG0 SEG23 DH1 DH2 VDD1 VDD2 VDD3 Connect to capacitor and VDD to generate LCD voltage Vcc COM0 LCD PANEL (1/3 Bias 1/4 Duty)
RD0 RD1 RD2 RD3
INT RES XOUT or XIN VSS *1(option)
RE0 RE1 RE2 RE3 MFP Vcc
Note : *1 is for accuracy
-7-
Publication Release Date: Feb 2002 Revision A2

▲Up To Search▲

Price & Availability of W541C250

	To Download W541C250 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .