SPC08A datasheet(6/15 Pages) ETC

6 / 15 page

SPC08A

Input/Output IOB port : IOB3 - 0

60K

OD : Open Drain

input data

logic_3

control

output

data

OD-NMOS

buffer

Input/Output IOB port : IOB5 - 4

60K

OD : Open Drain

input data

logic_4

control

output

data

OD-NMOS

buffer

Input/Output IOD port : IOD3 - 0

60K

OD : Open Drain

input data

logic_5

control

output

data

OD-PMOS

buffer

Input/Output IOD port : IOD5 - 4

60K

OD : Open Drain

input data

logic_6

control

output

data

OD-PMOS

buffer

*Values shown are for VDD = 5.0V test conditions only.

6.8. Timer/Counter

SPC08A contains one 12-bit timer/counter, TMA respectively.

TMA can be specified as a timer or a counter. In the timer mode,

the TMA is a re-loaded up-counter. When timer overflows, the

user's pre-set value will be reloaded automatically and the timer

upcounts again. At the same time, interrupt will be generated if

the interrupt is enabled. If TMA is specified as a counter, users

can reset by loading #0 into the counter. After the counter has

been activated, the value of the counter can also be read from the

counters at the same time.

Clock source of Timer/Counter can be selected as follows:

Timer/Counter

Clock Source

12-BIT TIMER

CPU CLOCK (T) or T/4

TMA

12-BIT COUNTER

T/64, T/8192, T/65536 or EXT

CLK

MODE SELECT REGISTER

TMA only, select timer or counter

TIMER CLOCK SELECTOR

Select T or T/4

Proprietary & Confidential

SEP. 19, 2001

Version: 1.7

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