参数资料
型号: ST7FLITE19BF0B6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP20
封装: 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-20
文件页数: 128/159页
文件大小: 2855K
代理商: ST7FLITE19BF0B6
ST7LITE1xB
70/159
DUAL 12-BIT AUTORELOAD TIMER 4 (Cont’d)
11.2.3.7 Force Update
In order not to wait for the counterx overflow to
load the value into active DCRx registers, a pro-
grammable counterx overflow is provided. For
both counters, a separate bit is provided which
when set, make the counters start with the over-
flow value, i.e. FFFh. After overflow, the counters
start counting from their respective auto reload
register values.
These bits are FORCE1 and FORCE2 in the
ATCSR2 register. FORCE1 is used to force an
overflow on Counter 1 and, FORCE2 is used for
Counter 2. These bits are set by software and re-
set by hardware after the respective counter over-
flow event has occurred.
This feature can be used at any time. All related
features such as PWM generation, Output Com-
pare, Input Capture, One-pulse (refer to Figure 15.
Dynamic DCR2/3 update in One Pulse Mode) can
be used this way.
Figure 50. Force Overflow Timing Diagram
FFF
ATRx
E04
E03
fCNTRx
CNTRx
FORCEx
FORCE2 FORCE1
ATCSR2 Register
1
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