參數(shù)資料
型號(hào): Q67121-C1068
廠商: SIEMENS AG
元件分類: 8位微控制器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8位CMOS微控制器
文件頁數(shù): 37/69頁
文件大?。?/td> 1124K
代理商: Q67121-C1068
Semiconductor Group
37
1997-07-01
C515C
Compare Mode 1
If compare mode 1 is enabled and the software writes to the appropriate output latch at the port, the
new value will not appear at the output pin until the next compare match occurs. Thus, it can be
choosen whether the output signal has to make a new transition (1-to-0 or 0-to-1, depending on the
actual pin-level) or should keep its old value at the time when the timer value matches the stored
compare value.
In compare mode 1 (see
figure 14
) the port circuit consists of two separate latches. One latch
(which acts as a "shadow latch") can be written under software control, but its value will only be
transferred to the port latch (and thus to the port pin) when a compare match occurs.
Figure 14
Compare Function in Compare Mode 1
MCS02662
Latch
Port
Q
Q
CLK
D
Read Pin
CC
V
D
CLK
Q
Shadow
Latch
Read Latch
Port Circuit
Internal
Bus
Latch
Write to
Compare Reg.
Compare Register
Circuit
Comparator
Timer Register
Timer Circuit
Compare
Match
Pin
Port
16 Bit
16 Bit
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