參數(shù)資料
型號(hào)： SST89V554A-33-C-TQJ
廠商： SILICON STORAGE TECHNOLOGY INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44
封裝： MS-026ACB, TQFP-44
文件頁(yè)數(shù)： 51/87頁(yè)
文件大?。?/td> 996K
代理商： SST89V554A-33-C-TQJ
Preliminary Specifications
FlashFlex51 MCU
SST89E554A / SST89V554A
55
2003 Silicon Storage Technology, Inc.
S71228-00-000
6/03
8.3.3 High Speed Output Mode
The high speed output mode is used to toggle a port pin
when a match occurs between the PCA timer and the pre-
loaded value in the compare registers. In this mode, the
CEX output pin (on port 1) associated with the PCA mod-
ule will toggle every time there is a match between the PCA
counter (CH and CL) and the capture registers (CCAPnH
and CCAPnL). To activate this mode, the user must set
TOG, MAT, and ECOM bits in the module’s CCAPMn SFR.
High speed output mode is much more accurate than tog-
gling pins since the toggle occurs before branching to an
interrupt. In this case, interrupt latency will not affect the
accuracy of the output. When using high speed output,
using an interrupt is optional. Only if the user wishes to
change the time for the next toggle is it necessary to
update the compare registers. Otherwise, the next toggle
will occur when the PCA timer rolls over and matches the
last compare value. (See Figure 8-4)
FIGURE
8-4: PCA HIGH SPEED OUTPUT MODE
1228 F25.0
CF
CR
CCF4
CCF3
CCF2
CCF1
CCF0
ECOMn CAPPn CAPNn
MATn
TOGn
PWMn ECCFn
CCON
CCAPMn
n=0 to 4
PCA Interrupt
CH
CL
CCAPnH
CCAPnL
PCA Timer/Counter
0
00
16-bit Comparator
Reset
Write to
CCAPnL
Write to
CCAPnH
10
Enable
Match
CEXn
Toggle
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