21

* 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

P31(3,2)

P4.0/SOUND

SOUND

P4.1/TRGH

8-bit binary counter

P31(1,0)

P11

÷2

P10

XIN

Input data

Data bus

Reload

Overflow

HTCI interrupt

Timer/counter B

Output data

mask option

For the pulse width measurement mode, the counter only incresed by the rising edge of internal pulse rate as

external timer/counter input (P8.1/TRGB, P8.3/TRGA ), interrupt request will be generated as soon as

timer/counter count overflow.

Internal pulse

TimerB(TimerA) value

n

n+1

n+2

n+3

n+4

n+5

P8.1/TRGB(P8.3/TRGA)

LDIA #1100b;

OUTA P28; Enable timerA with pulse width measurement mode.

HIGH SPEED TIMER/COUNTER

HIGH SPEED TIMER/COUNTER

HIGH SPEED TIMER/COUNTER

HIGH SPEED TIMER/COUNTER

HIGH SPEED TIMER/COUNTER

EM73P461A has one 8-bit high speed timer/counter (HTC). It supports three special functions : auto load

timer, melody output and pulse width measurement modes. The HTC is available for the NORMAL and

SLOW operation mode.

The HTC can be set initial value and send counter value to counter registers (P11 and P10), P31 is the

command port for HTC, user can choose different operation mode and different internal clockrate by setting

the port. The timer/counter increase one at the rising edge of internal pulse. The HTC can generate an overflow

interrupt (HTCI) when it overflows. The HTCI cannot be generated when the HTC is in the melody mode

or disabled.

P31 is the command register of the 8-bit high speed timer/counter.

P31

32

1

0

Initial value : 0000

HTMS

HIPS

HTMS

Mode selection

HIPS

Clock rate selection

NORMAL mode

SLOW mode

0 0

Stop

0 0

0 1

Auto load timer mode

0 1

1 0

Melody mode

1 0

Reserved

1 1

Pulse width measurement mode

1 1

Reserved

P11 and P10 are the counter registers of the 8-bit high speed timer/counter. P10 is the lower nibble register

and P11 is the higher nibble register. (HT is the value of counter registers.)

P11

32

1

0

P10

32

10

Initial value : 0000 0000 (HT)

Higher nibble register

Lower nibble register