参数资料
型号: SPMC16V1CPU20
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 20.97 MHz, MICROCONTROLLER, PQFP100
封装: TQFP-100
文件页数: 56/128页
文件大小: 571K
代理商: SPMC16V1CPU20
MC68HC16V1
MOTOROLA
MC68HC16V1TS/D
33
The software watchdog period register (SWP) contains the value that is loaded into the software watch-
dog downcounter. The lower byte of SWP must be written in order to trigger the software watchdog
downcounter.
SWP is readable and writable at any time. Writes to this register reset the prescaler if the SREN bit in
SYPCR is set.
A zero loaded into this register turns off and clears the software watchdog downcounter.
SWP is not affected by reset. Therefore, the value programmed into SWP before reset occurs is re-
tained. Power-on resets SWP to zero.
The SWP count value is determined by the following equation:
Table 15 shows the software watchdog period ranges.
1. Refer to Table 17 for chained timer time-out period information.
2. These frequency categories are frequencies which are output from the clock select mux to the prescaler. The
prescaler frequency is defined as fpre = fsys/2 if PCLK = 0 or fpre = fref/2 if PCLK = 1. Refer to Figure 9.
SWP — Software Watchdog Period Register
$YFFA58
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
POWER-ON RESET ONLY:
0
Table 15 Software Watchdog Period Ranges (Timers Not Chained)1
SWC[2:0] Clock
Control Settings
Clock
Source
Time-Out Ranges for Typical Values of fref and fsys
2
32.768 kHz
4.194 MHz
16.777 MHz
20.972 MHz
000
fsys/2
61.0
s to
4.0 s
477 ns to
31.3 ms
119 ns to
7.81 ms
95.4 ns to
6.25 ms
001
fref/2
61.0
s to
4.0 s
477 ns to
31.3 ms
119 ns to
7.81 ms
95.4 ns to
6.25 ms
010
fpre/1024
62.5 ms to
68.3 mins
488
s to
32 s
122
s to
8 s
97.7
s to
6.4 s
011
fpre/256
15.6 ms to
17.1 mins
122
s to
8 s
30.5
s to
2 s
24.4
s to
1.6 s
100
fpre/64
3.91 ms to
4.27 mins
30.5
s to
2 s
7.63
s to
500 ms
6.10
s to
400 ms
101
fpre/16
977
s to
64.0 s
7.63
s to
500 ms
1.91
s to
125 ms
1.53
s to
100 ms
1
0
Chained Timer
1
Software Watchdog
Off
——
SWP Count Value
Desired SWDOG Time-out Period
SWDOG Clock Source
×
=
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