D75108CW NEC, D75108CW Datasheet - Page 23

• Manufacturer Part Number: D75108CW
• Description: Search -----> UPD75108CW
• Manufacturer: NEC

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5.4
5.5
can be selected and the function to supply clocks to the serial interface.
SET1*
From the
clock generator
The basic interval timer has these functions:
These two channels are almost identical in terms of configuration and function except the count pulse (CP) that
The functions of the timer/event counter include:
• Programmable interval timer operation
• Output of square wave at an arbitrary frequency to PTOn pin
• Event counter operation
• Input of TIn pin signal as external interrupt input signal
• Dividing TIn pin input by N to output to PTOn pin (frequency divider operation)
• Supply of serial shift clock to serial interface circuit (channel 0 only)
• Reading counting status
f
f
f
f
PD75108 contains two channels of timer/event counters.
X
X
X
X
Remarks : *: Instruction execution
Interval timer operation which generates a reference time interrupt
Watchdog timer application which detects a program runaway
Selects the wait time for releasing the standby mode and counts the wait time
Reads out the count value
X
X
X
X
/2
/2
/2
/2
BASIC INTERVAL TIMER
TIMER/EVENT COUNTER
BTM3
5
7
9
12
BTM2
4
BTM1
MPX
3
Fig. 5-3 Basic Interval Timer Configuration
BTM0
BTM
(8-bit frequency divider circuit)
Internal bus
Basic interval timer
8
Clear
BT
Wait release signal
for standby release
PD75104, 75106, 75108
Set
signal
request flag
interrupt
BT
Clear
IRQBT
Vector
interrupt
request
signal
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