17

* This specification are subject to be changed without notice.

EM73P461A

EM73P461A

EM73P461A

EM73P461A

EM73P461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

12.27.2001

Preliminary

Preliminary

Preliminary

Preliminary

Preliminary

NORMAL OPERATION MODE

NORMAL OPERATION MODE

NORMAL OPERATION MODE

NORMAL OPERATION MODE

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

operation mode by the command register (P22 or P16).

The instruction cycle is 8/fc in NORMAL operation mode.

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

mode.

SLOW OPERATION MODE

SLOW OPERATION MODE

SLOW OPERATION MODE

SLOW OPERATION MODE

SLOW OPERATION MODE

The SLOW operation mode is a single clock system (low-frequency(fs) 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.

The instruction cycle is 4/fs or 8/fs by frequency double mask option in SLOW operation mode.

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

P22

32

1

0

Initial value : 0000

*

SOM

*

*

SOM

Select operation mode

0

NORMAL operation mode

1

SLOW operation mode

P14

32

10

Initial value : *000

*

WKS

LFS CPUS

LFS

Low-frequency status

CPUS

CPU status

0

LXIN source is not stable

0

NORMAL operation mode

1

LXIN source is stable

1

SLOW operation mode

WKS

Wakeup status

0

Wakeup not by internal timer

1

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

IDLE OPERATION MODE

IDLE OPERATION MODE

IDLE OPERATION MODE

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).