參數(shù)資料
型號: PD75104
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機(jī)
文件頁數(shù): 23/70頁
文件大?。?/td> 485K
代理商: PD75104
μ
PD75104, 75106, 75108
23
5.4
BASIC INTERVAL TIMER
The basic interval timer has these functions:
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
Remarks : *: Instruction execution
Fig. 5-3 Basic Interval Timer Configuration
From the
clock generator
f
X
/2
5
X
f
X
/2
7
X
f
X
/2
9
X
f
X
/2
12
X
MPX
Clear
Basic interval timer
(8-bit frequency divider circuit)
3
4
8
BT
Clear
Set
signal
BT
interrupt
request flag
IRQBT
Wait release signal
for standby release
Vector
interrupt
request
signal
Internal bus
BTM3
BTM2
BTM1
BTM0
BTM
SET1*
5.5
TIMER/EVENT COUNTER
μ
PD75108 contains two channels of timer/event counters.
These two channels are almost identical in terms of configuration and function except the count pulse (CP) that
can be selected and the function to supply clocks to the serial interface.
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
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