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