LC877448A/40A/32A/24A

No.7776-2/22

Features

(1) Read-Only Memory (ROM)

• 49152 × 8 bits (LC877448A)

• 40960 × 8 bits (LC877440A)

• 32768 × 8 bits (LC877432A)

• 24576 × 8 bits (LC877424A)

(2) Random Access Memory (RAM): 1536 × 9 bits (LC877448A, LC877440A, LC877432A, LC877424A)

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

Note: The bus cycle time indicates ROM read time.

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

(5) Ports

• Input / output ports

Data direction programmable for each bit individually:

26 (P1n, P30 to P35, P70 to P73, P8n)

Data direction programmable in nibble units:

8 (P0n)

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

• Input ports:

2 (XT1, XT2)

• LCD ports

Segment output:

48 (S00 to S47)

Common output:

4 (COM0 to COM3)

Bias terminals for LCD driver:

3 (V1 to V3)

Other functions

Input / output ports:

48 (PAn, PBn, PCn, PDn, PEn, PFn)

Input ports:

7 (PLn)

• Oscillator pins:

2 (CF1, CF2)

• Reset pin:

1 (RES)

• Power supply:

6 (VSS1 to 3, VDD1 to 3)

(6) LCD controller

• Seven display modes are available (static, 1/2, 1/3, 1/4 duty × 1/2, 1/3 bias)

• Segment output and common output can be switched to general purpose input / output ports.

(7) Small signal detection (MIC signals etc)

• Counts pulses with the level which is 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 / counter with toggle output function

Mode 0: 8 bit timer (with toggle output) + 8 bit timer / counter (with toggle output)

Mode 1: 2 channel 8 bit PWM

Mode 2: 16 bit timer / counter (with toggle output) Toggle output from lower 8 bits is also possible.

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

• Timer 4: 8 bit timer with 6 bit prescaler

• Timer 5: 8 bit timer with 6 bit prescaler

• Timer 6: 8 bit timer with 6 bit prescaler

• Timer 7: 8 bit timer with 6 bit prescaler

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