EM73880 datasheet(16/40 Pages) EMC

16 / 40 page

* This specification are subject to be changed without notice.

EM73880

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

11.30.2001

Preliminary

These three functions can be executed by 2 timer/counter independently.

For timerA, the counter data is saved in timer register TAH, TAM, TAL, which user can set counter initial

value and read the counter value by instruction "LDATAH(M,L), STATAH(M,L)" and timer register is

TBH, TBM, TBL and W/R instruction "LDATBH (M,L), STATBH (M,L)".

The basic structure of timer/counter is composed by two same structure counter, these two counters can be

set initial value and send counter value to timer register, P28 and P29 are the command ports for timerA

and timer B, user can choose different operation mode and different internal clock rate by setting these two

ports. When timer/counter overflow, it will generate a TRGA(B) interrupt request to interrupt control unit.

INTERRUPT CONTROL

TRGA request

P8.3/

TRGA

EVENT COUNTER CONTROL

TIMER CONTROL

internal clock

P28

12 BIT COUNTER

TMSA

IPSA

DATA BUS

P8.1/

TRGB

EVENT COUNTER CONTROL

TIMER CONTROL

internal clock

high speed timer/counter

P29

12 BIT COUNTER

MUX

TMSB

IPSB

TRGB request

PULSE-WIDTH MEASUREMENT

CONTROL

PULSE-WIDTH MEASUREMENT

CONTROL

Port 28

TMSA

IPSA

Initial state: 0000

TIMER/COUNTER MODE SELECTION

TMSA (B)

Function description

0 0

Stop

0 1

Event counter mode

1 0

Timer mode

1 1

Pulse width measurement mode

Port 29

TMSB

IPSB

Initial state: 0000

TIMER/COUNTER CONTROL

P8.1/TRGB, P8.3/TRGA are the external timer inputs for timerB and timerA, they are used in event

counter and pulse-width measurement mode.

Timer/counter command port: P28 is the command port for timer/counterA and P29 is for the timer/

counterB.

INTERNAL PULSE-RATE SELECTION

IPSA NORMAL mode SLOW mode

IPSB NORMAL mode

SLOW mode

0 0

LXIN/23 Hz

Reserved

0 0

Depend on high speed timer/counter

0 1

LXIN/27 Hz

0 1

LXIN/25 Hz

1 0

LXIN/211 Hz

1 0

LXIN/29 Hz

1 1

LXIN/215 Hz

1 1

LXIN/213 Hz

EM73880 Datasheet(PDF) 16 Page - ELAN Microelectronics Corp

EM73880 Datasheet(HTML) 16 Page - ELAN Microelectronics Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Datasheet Download

Link URL