參數(shù)資料
型號(hào)： UPD754244GS
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 4位單晶片微控制器
文件頁數(shù)： 22/88頁
文件大?。?/td> 416K
代理商： UPD754244GS
22
μ
PD754144, 754244
7.3 Basic Interval Timer/Watchdog Timer
The basic interval timer/watchdog timer has the following functions.
(a) Interval timer operation to generate a reference time interrupt
(b) Watchdog timer operation to detect a runaway of program and reset the CPU
(c) Selects and counts the wait time when the standby mode is released (
μ
PD754244 only)
Note 1
(d) Reads the contents of counting
Figure 7-3. Basic Interval Timer/Watchdog Timer Block Diagram
Notes 1.
In the
μ
PD754144 (RC oscillation), the wait time cannot be specified when the standby mode
is released. The oscillation stabilization wait time is negligible in the
μ
PD754144 and this device
returns to the normal operation mode after counting 2
9
/f
CC
(512
μ
s: @ f
CC
= 1.0-MHz operation).
In the
μ
PD754244 (crystal/ceramic oscillation), on the other hand, the wait time can be specified
when the standby mode is released.
Instruction execution.
2.
From clock
generator
f
X
/2
5
f
X
/2
7
f
X
/2
9
f
X
/2
12
MPX
BTM3 BTM2 BTM1 BTM0 BTM
4
SET1
Note 2
Internal bus
8
1
Basic interval timer
(8-bit frequency divider)
Clear
BT
Wait release signal
when standby is
released
Note 1
.
Set
Clear
3
WDTM
SET1
Note 2
Internal reset
signal
Vectored
interrupt
request signal
BT
interrupt
request flag
IRQBT
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