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: 57/128页
文件大小: 571K
代理商: SPMC16V1CPU20
MOTOROLA
MC68HC16V1
34
MC68HC16V1TS/D
The software watchdog downcounter (SWDC) consists of a 16-bit downcounter clocked by the output
of the prescaler multiplexer. This signal is applied to SWDC which counts down to zero when loaded
with the SWP value. SWDC does not begin counting until the lower byte of SWP is written.
When the software watchdog times out, depending on the state of the IRSEL bit in SYPCR, it asserts a
reset or generates an interrupt. SWDC is then loaded with the current time-out value from the SWP and
begins counting down again. The time-out value may be changed at any time.
After timeout occurs, the software watchdog zero flag (SZ) in SYPCR is set.
SWDC is readable at any time.
When RESET is asserted, SWDC is not affected.
3.4.6 Real-Time Clock
The real-time clock (RTC) consists of a 16-bit downcounter clocked by the RTCLK output of the RTC
prescaler multiplexer.
RTCLK is applied to a 16-bit downcounter that counts down to zero when loaded with the RTP value.
RTDC does not start counting until the lower byte of RTP is written.
The real-time period register (RTP) contains the value to be loaded into the RTC downcounter. The low-
er byte of RTP must be written in order to trigger the real-time downcounter, both when chained and
when not chained.
Writes to this register reset the prescaler if the REN bit in SYPCR is set. A zero loaded into this register
turns off and clears the RTC downcounter.
The RTP count value is determined by the following equation:
Table 16 shows the real-time period ranges.
SWDC — Software Watchdog Downcounter
$YFFA5C
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
POWER-ON RESET ONLY:
0
RTP — Real-Time Period Register
$YFFA5A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
POWER-ON RESET ONLY:
0
RTP Count Value
Desired RTC Time-out Period
RTC Clock Source
×
=
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