EM73866 查看數據表（PDF） - ELAN Microelectronics

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EM73866

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73866

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

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 by the command register (P22), STOP operation mode by P16 and IDLE

operation mode by P19.

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

mode.

P22 3

*

2

1

0

SOM

Initial value : 0000

SOM

000

001

010

011

1**

Low-frequency

2^3/LXIN RC solw to normal

2^4/LXIN RC solw to normal

2^11/LXIN X'tal slow to normal

2^12/LXIN X'tal slow to normal

normal to slow

With low-frequency double

2^3/LXIN RC solw to normal

2^4/LXIN RC solw to normal

2^11/LXIN X'tal slow to normal

2^12/LXIN X'tal slow to normal

normal to slow

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

0

1

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. 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),

P2(0..3)/WAKEUP(4..7), P4(0..3)/WAKEUP(8..11), P5(0..3)/WAKEUP(12..15), P7.0/WAKEUPD or P8

(0..2)/WAKEUP(A..C) ).

* This specification are subject to be changed without notice.

12.29.1999 15

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