11901 RM (IM) SK No.6843-1/23

Ver.1.01

51000

Preliminary

Overview

The LC876694B/LC876678B/LC876662B are 8 bit single chip microcontrollers with the following on-chip functional

blocks :

- CPU: operable at a minimum bus cycle time of 100ns

- On-chip ROM Maximum Capacity : LC876694B 96K bytes

LC876678B 80K bytes

LC876662B 64K bytes

- On-chip RAM: 2048 bytes

- VFD automatic display controller / driver

- 16 bit timer / counter (can be divided into two 8 bit timers)

- 16 bit timer / PWM (can be divided into two 8 bit timers)

- timer for use as date / time clock

- High speed clock counter

- System clock divider function

- synchronous serial I/O port (with automatic block transmit / receive function)

- asynchronous / synchronous serial I/O port

- 12-channel

8-bit AD converter

- Weak signal detector

- 15-source 10-vectored interrupt system

All of the above functions are fabricated on a single chip.

Features

(1) Read-Only Memory (ROM): LC876694B 98304

8 bits

LC876678B 81920 × 8 bits

LC876662B 65536

8 bits

(2) Random Access Memory (RAM): LC876694B/78B/62B 2048

9 bits

(3) Minimum Bus Cycle Time: 100ns (10MHz)

Note: The bus cycle time indicates ROM read time.

(4) Minimum Instruction Cycle Time: 300ns (10MHz)

8-Bit Single-Chip Microcontroller

LC876694B/78B/62B

Ordering number : ENN*6843

CMOS IC

LC876694B/78B/62B

No.6843-2/23

(5) Ports

- Input/output ports

Data direction programmable for each bit individually : 20 (P1n, P70 to P73, P8n)

- 15V withstand input/output ports

Data direction programmable in nibble units : 8 (P0n)

(When N-channel open drain output is selected, data can be input in bit units.)

Data direction programmable for each bit individually : 8 (P3n)

- Input ports : 2 (XT1,XT2)

- VFD output ports

Large current outputs for digits : 9 (S0 / T0 to S8 / T8)

Large current outputs for digits / segments : 7 (S9 / T9 to S15 / T15)

digit / segment outputs : 8 (S16 to S23)

segment outputs : 28 (S24 to S51)

Other functions

Input/output ports : 12(PFn, PG0 to 3)

Input ports : 24 (PCn, PDn, PEn)

- Oscillator pins : 2 (CF1,CF2)

- Reset pin : 1 (RES#)

- Power supply : 6 (VSS1 to 2, VDD1 to4)

- VFD power supply : 1 (VP)

(6) VFD automatic display controller

- Programmable segment/digit output pattern

Output can be switched between digit/segment waveform output (pins 9 to 24 can be used for output of digit

waveforms).

parallel-drive available for large current VFD.

- 16-step dimmer function available

(7) Weak signal detection (MIC signals etc)

- Counts pulses with width greater than a preset value

- 2 bit counter

(8) Timers

- Timer 0: 16 bit timer / counter with capture register

Mode 0: 2 channel 8-bit timer with programmable 8 bit prescaler and 8 bit capture register

Mode 1: 8 bit timer with 8 bit programmable prescaler and 8 bit capture register + 8 bit

Counter with 8-bit capture register

Mode 2: 16 bit timer with 8 bit programmable prescaler and 16 bit capture register

Mode 3: 16 bit counter with 16 bit capture register

- Timer 1: PWM / 16 bit timer toggle output

Mode 0: 2 channel 8 bit timer (with toggle output)

Mode 1: 2 channel 8 bit PWM

Mode 2: 16 bit timer (with toggle output) Toggle output also possible using lower order 8 bits.

Mode 3: 16 bit timer (with toggle output) Lower order 8 bits can be used as PWM output.

- Base Timer

1) The clock signal can be selected from any of the following :

Sub-clock (32.768kHz crystal oscillator), system clock, and prescaler output from timer 0

2) Interrupts can be selected to occur at one of five different times.

(9) High speed clock counter

1) Capable of counting maximum: 20MHz clock (Using main clock 10MHz)

2) Real time output

LC876694B/78B/62B

No.6843-3/23

(10) Serial-interface

- SIO 0: 8 bit synchronous serial Interface

1) LSB first / MSB first function available

2) Internal 8 bit baud-rate generator (maximum transmit clock period 4 / 3 Tcyc)

3) Continuous automatic data communication (1-256 bits)

- SIO 1: 8 bit asynchronous / synchronous serial interface

Mode 0: Synchronous 8 bit serial IO (2-wire or 3-wire, transmit clock 2–512 Tcyc)

Mode 1: Asynchronous serial IO (half duplex, 8 data bits, 1 stop bit, baud rate 8–2048Tcyc)

Mode 2: Bus mode 1 (start bit, 8 data bits, transmit clock 2–512 Tcyc)

Mode 3: Bus mode 2 (start detection, 8 data bits, stop detection)

(11) AD converter

-8 bits

12 channels

(12) Remote control receiver circuit (connected to P73 / INT3 / T0IN terminal)

-Noise rejection function (noise rejection filter time constant can selected from 1 / 32 / 128 Tcyc)

(13) Watchdog timer

- The watching timer period is set using an external RC.

- Watchdog timer can produce interrupt, system reset

(14) Interrupts: 15-source, 10-vectored interrupts

1) Three priority (low, high and highest) multiple interrupts are supported. During interrupt handling, an equal or

lower priority interrupt request is refused.

2) If interrupt requests to two or more vector addresses occur at once, the higher priority interrupt takes precedence.

In the case of equal priority levels, the vector with the lowest address takes precedence.

(15) Subroutine stack levels: 1024 levels max. Stack is located in RAM.

(16) Multiplication and division

- 16 bit

8 bit (executed in 5 cycles)

- 24 bit

16 bit (12 cycles)

- 16 bit ÷ 8 bit (8 cycles)

- 24 bit ÷ 16 bit (12 cycles)

(17) Oscillation circuits

- On-chip RC oscillation circuit for system clock use.

- On-chip CF oscillation circuit for system clock use. (R

built in)

- On-chip Crystal oscillation circuit low speed system clock use. (Rd, R

external)

(18) System clock divider function

- Able to reduce current consumption

Available minimum instruction cycle time: 300ns, 600ns, 1.2µs, 4.8µs, 9.6µs, 19.2µs, 38.4µs, 76.8µs.

(Using 10MHz main clock)

Part #	87666-2
Description	CONN CONT RCP 1 POS CRMP ST CBL MNT STRP - Tape and Reel
Category	CONTACT
Availability	In Stock
Qty	7700

Qty	Price
1 - 355	$0.42253
356 - 892	$0.33611
893 - 1,735	$0.31690
1,736 - 2,631	$0.29449
2,632 +	$0.26248

87666-2

Related Items

Technical Document