EM73880 datasheet(14/40 Pages) EMC

14 / 40 page

* This specification are subject to be changed without notice.

EM73880

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

11.30.2001

Preliminary

NORMAL OPERATION MODE

The 4-bit µc is in the NORMAL operation mode when the CPU is reseted. This mode is a dual clock system

(high-frequency and low-frequency clocks oscillating). It can be changed to SLOW or STOP operation

mode by the command register (P22 or P16).

LCD display and high speed timer/counter with melody output are available for the NORMAL operation

mode.

SLOW OPERATION MODE

The SLOW operation mode is a single clock system (low-frequency clock oscillating). It can be changed to

the DUAL operation mode with the commoand register (P22), STOP operation mode with P16 and IDLE

operation mode with P19.

LCD display and high speed timer/counter with melody output are available for the SLOW operation

mode.

P22

210

Initial value : 0000

SOM

Select operation mode

NORMAL operation mode

SLOW operation mode

P14

Initial value : *000

WKS

LFS CPUS

LFS

Low-frequency status

CPUS

CPU status

LXIN source is not stable

NORMAL operation mode

LXIN source is stable

SLOW operation mode

WKS

Wakeup status

Wakeup not by internal timer

Wakeup by internal timer

Port14 is the status register for CPU. P14.0 (CPU status) and P14.1 (Low-frequency status) are read-only

bits. p14.2 (wakeup status) will be set to '1' when CPU is wake-up by internal timer. P14.2 will be cleared to

'0' when user out data to P14.

IDLE OPERATION MODE

The IDLE operation mode suspends all SLOW operations except for the low-frequency clock and LCD

driver. It retains the internal status with low power consumption without stopping the clock function and

LCD display.

LCD display is available for the IDLE operation mode. Sound generator is disabled in this mode. The IDLE

operation mode will be wakeup and return to the SLOW operation mode by the internal timing generator or

I/O pins (P0(0..3)/WAKEUP 0..3 or P8(0..3)/WAKEUPA..D).

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