GENERAL DESCRIPTIONTM89P51M is a One Time PROM embedded high-performance 4-bit
microcomputer with LCD driver. It contains all the necessary functions,
such as 4-bit parallel processing ALU, ROM, RAM, I/O ports, timer, clock
generator, dual clock operation, Resistance to Frequency Converter (RFC),
EL panel driver, LCD driver, look-up table, watchdog timer and key matrix
scanning circuitry in a signal chip.
FEATURES
1.Low power dissipation.
1.5V/3V operating voltage range.
2.Powerful instruction set.
Binary addition, subtraction, BCD adjustment. BCD can be executed
directly in addition, subtraction operation.
4 bits x 4 bits Multiplier
Single-bit manipulation (set, reset, decision for branch).
Various conditional branches.
16 initial working registers and manipulators (can be extended to all
RAM by Page Mode)
Table look-up.
LCD driver data transfer.
3.ROM capacity. 8K x 16 bits.
Instructon ROM Max. capacity 8K x 16 bits.
Table ROM Max. capacity 8K/4K x 8/16 bits.
4.RAM capacity. 960/480/240 x 4/8/16 its.
LCD Max. capacity 192/96/48 x 4/8/16 bits.
STACK Max. capacity 16 x 16 bits.
HL/ZR store Max. capacity 16/16 x 16 bits.
5.With direct/index addressing mode in data RAM access.
6.LCD driver output.
Max 432 LCD dots by 9 common outputs and 48 segment outputs.
SEG41~60 can be defined as IOB1~4, KI1~4, ELC, ELP, BZB, BZ,
IOD1~4, IOC1~4 by option.
1/4~1/19 Duty can be selected by option.
1/3 ~1/4 Bias can be selected by option.
Single instruction to turn off all segments.
COM5~9 can be defined as CMOS or P_open drain type output by option.
External regulator mode for VL1/2 by option.
7.Input/output ports.
Port IOA 4 pins (with internal pull-low, input signal chattering prevention
circuitry),
and can be defined as CX, RFC0~2 by option.
Port IOB 4 pins (with internal pull-low), and can be defined as SEG41~44
by option.
Port IOC 4 pins (with internal pull-low, low-level-hold, input signal
chattering prevention circuitry), and can be defined as SEG57~60 by option.
Port IOD 4 pins (with internal pull-low, input signal chattering prevention
circuitry),
and can be defined as SEG53~56 by option.
8.Interrupt function.
External factors 5 (INT pin, Port IOA, IOC, IOD & KI input).
Internal factors 5 (Pre-Divider, Timer1, Timer2, Timer3 & RFC).
9.Built-in EL-light driver.
ELC, ELP. Can be defined as SEG49, 50 by option.
10.Built-in Alarm, clock or single tone melody generator.
BZB, BZ. Can be defined as SEG51, 52 by option.
11.Built-in resistance to frequency converter.
CX, RFC0~2. Can be defined as IOA1~4 by option.
12.Built-in key matrix scanning function.
KO1~KO16 (Shared with SEG1~16)
KI1~KI4. Can be defined as SEG45~48 by option.
13.Three 6-bit programmable timers with programmable clock source.
Read out the content in anytime
Merged 2 or 3 timers as 12-bit or 18-bit timer
Used as counter for RFC
14.Watchdog timer.
15.Built-in voltage charge halver & pump circuit.
16.Dual clock operation
slow clock oscillation can be defined as X’tal or external RC type
oscillator by option.
fast clock oscillation can be defined as 3.58 MHz ceramic resonator,
internal R or external R type oscillator by option.
17.HALT function.
18.STOP function.
APPLICATIONTimer / Calendar / Calculator / Thermometer