參數(shù)資料
型號: SAF-C513A-HN
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, EEPROM, 8 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 82/128頁
文件大?。?/td> 1837K
代理商: SAF-C513A-HN
Semiconductor Group
6-24
On-Chip Peripheral Units
6.2.2.1
Auto-Reload Mode (Up or Down Counter)
Timer 2 can be programmed to count up or down when configured in its 16-bit auto-reload mode.
This feature is invoked by a bit named DCEN (Down Counter Enable), which is located in SFR
T2MOD. When DCEN is set, timer 2 can count up or down depending on the value of pin T2EX
(P1.1).
Special Function Register T2MOD (Address C9H)
Reset Value : XXXXXXX0B
Figure 6-23 shows timer 2 automatically counting up when DCEN=0. In this mode there are two
options selectable by bit EXEN2 in SFR T2CON.
Figure 6-23
Timer 2 Auto-Reload Mode (DCEN = 0)
Bit
Function
Not implemented, reserved for future use.
DCEN
When set, this bit allows timer 2 to be configured as an up/down counter. With
T2EX=0 down-counting is selected, with DCEN=1 up-counting is enabled.
–––
C9H
T2MOD
Bit No.
7
65
43
21
0
MSB
LSB
––
DCEN
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