LC877917A

No.A1840-2/29

Ports

• Input/output ports

Data direction programmable for each bit individually:

21 (P0n, P1n, P30, P70-P73)

Other function

LCD ports (segment output):

8 (P1n)

• LCD ports & General I/O ports

Segment output:

32 (S00-S31)

Common output:

4 (COM0-COM3)

Bias terminals for LCD driver

5 (V1-V3, CUP1, CUP2)

Other functions

Input/output ports:

36 (LPAn, LPBn, LPCn, LPLn, P1n)

• Oscillator pins:

4 (CF1, CF2, XT1, XT2)

• Reset pin:

1 (RES)

• Power supply:

5 (VSS1-2, VDD1-2, V2)

1 (VDC)

LCD Controller

(1) Seven display modes are available

(2) Duty 1/3duty, 1/4duty

(3) Bias 1/2bias, 1/3bias

(4) Segment output can be switched to general purpose input/output ports.

(5) LCD frame rate frequency: 16 to 85.3Hz (programmable)

(6) LCD power range

1) 1/3bias

V1 : 1.2V to 1.8V

V2 : 2.4V to 3.6V

V3 : 3.6V to 5.4V

Please use the LCD panel for V2 (=VDD)× 1.5[V], when you select 1/3bias.

For example, if the power supply voltage is 3.0V, the LCD panel must be 4.5V.

2) 1/2bias

V1 : 1.2V to 1.8V

V2 : 2.4V to 3.6V

V3 : 2.4V to 3.6V

(connect V2 and V3)

Please use the LCD panel for V2 (=VDD)[V], when you select 1/3bias.

For example, if the power supply voltage is 3.0V, the LCD panel must be 3.0V.

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: 2 channel 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 (with toggle output)

• Timer 7: 8-bit timer with 6-bit prescaler (with toggle output)

• Base Timer

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

Sub-clock (32.768kHz crystal oscillator / Slow RC oscillation), system clock, and prescaler output from timer 0.

(2) Interrupts of five different time intervals are possible.