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W921E840A

Features: Operating Voltage· 2.8 to 5.5V operating voltage for W921E840A EPROM Type· 2.4 to 5.5V operating voltage for W921C840 Mask ROM TypeOperating Frequency· Crystal or RC for main system clock- Crystal for 400 K, 800 K, 2 M, 3.58 M, 4 MHz- RC up to 4 MHzMemory· 8K ´ 10-bit ROM (super EP...

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W921E840A: Features: Operating Voltage· 2.8 to 5.5V operating voltage for W921E840A EPROM Type· 2.4 to 5.5V operating voltage for W921C840 Mask ROM TypeOperating Frequency· Crystal or RC for main system clock-...

W921E840A Data Sheet

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Part Number:
W921E840A
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Operating Voltage
· 2.8 to 5.5V operating voltage for W921E840A EPROM Type
· 2.4 to 5.5V operating voltage for W921C840 Mask ROM Type
Operating Frequency
· Crystal or RC for main system clock
- Crystal for 400 K, 800 K, 2 M, 3.58 M, 4 MHz
- RC up to 4 MHz
Memory
· 8K ´ 10-bit ROM (super EPROM)
· 512 ´ 4-bit RAM
- 64 ´ 4-bit special registers
- 16 ´ 4-bit working registers
- 128 ´ 4-bit general registers
- 304 ´ 4-bit multi-purpose registers
Stack
· 8-bit stack pointer
I/O Pins
· 20 bidirectional and individually controllable I/O lines
- P2 Port: P2.0 to P2.3 large sink current pins and open drain option
- P3 Port: P3.0 to P3.3 multi-function I/O
- P4 Port: P4.0 to P4.3 open drain and pull high resistor option, multi-function I/O
- P5 Port: P5.0 to P5.3 multi-function I/O
- P6 Port: P6.0 to P6.3 open drain and pull high resistor option, multi-function I/O
· 14 bidirectional I/O lines
- PA Port: PA.0 to PA.3 open drain and pull high resistor option
- PB Port: PB.0 to PB.3 open drain and pull high resistor option
- PC Port: PC.1 to PC.3 open drain and pull high resistor option
- PD Port: PD.0 to PD.1 open drain and pull high resistor option
Serial I/O Interface
· Clock synchronous multi-nibbles serial transmitter/receiver interface
DTMF Generator
· One channel DTMF generator
Beep Tone Generator
· One channel beep tone generator
8-bit D/A Converter
· One channel 8-bit D/A converter
Voltage Comparator
· Multiplexed four channel voltage comparator
Timer/Counter
· Timer 0: 2 to 19 order divider
Auto-reload timer
Watch-dog timer
· Timer 1: 2 to 19 order divider
Auto-reload timer
Arbitrary waveform generator
External event counter
· Timer 2: 2 to 19 order divider
Auto-reload timer
Arbitrary waveform generator
Period/pulse width measurement function
· Timer 3: 2 to 19 order divider
Auto-reload timer
Interrupt
· Four external sources: INT0 (P4.3), P4 Port (P4.0 to P4.2)
· Six internal sources: Timer 0, Timer 1, Timer 2, Timer 3, Comparator, Serial Port
Operating Mode (System Clock)
· Normal mode: system clock operating
· HOLD mode: no operation except for oscillator (system clock stops only)
· STOP mode: no operation including oscillator



Pinout

Connection Diagram


Specifications

PARAMETER
SYMBOL
RATING
UNIT
DC Supply Voltage
VDD-VSS
-0.3 to +7.0
V
Input/Output Voltage
VIL
VSS -0.3
 
VIH
VDD +0.3
V
VOL
VSS -0.3
VOH
VDD +0.3
Power Dissipation
PD
120
mW
Operation Temperature
TOPR
-20 to +70
°C
Storage Temperature
TSTG
-55 to +150
°C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.


Description

The W921E840A/W921C840 is single-chip CMOS 4-bit microcontroller that is subset of W921E880A/W921C880. W921E840A/W921C840 features four multi-function timers, one channel DTMF generator, an 8-bit D/A converter circuit, ten interrupt sources, 48-level subroutine nesting, and built in four by one channel comparator circuit. Two power down modes, hold and stop mode, reduce power dissipation.

The excellent memory structure, 8K super EPROM in W921E840A and 8K mask ROM in W921C840 for program code and 512 x 4 bit RAM minimize the need for external memory devices.

The W921E840A/W921C840 are powerful microcontroller for wide range consuming applications, requiring few external components, which is especially suited for telecommunication design.




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