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參數資料
| 型號： | W79E201A16PN |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | ROHS COMPLIANT, PLASTIC, LCC-44 |
| 文件頁數： | 47/87頁 |
| 文件大小： | 818K |
| 代理商： | W79E201A16PN |
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W79E201
Publication Release Date: December 16, 2004
- 47 -
Revision A2
Auto-reload Mode, Counting Up/Down
Timer/Counter 2 will be in auto-reload mode as an up/down counter if
and the DCEN bit in T2MOD is set. In this mode, Timer/Counter 2 is an up/down counter whose
direction is controlled by the T2EX pin. A 1 on this pin cause the counter to count up. An overflow
while counting up will cause the counter to be reloaded with the contents of the capture registers. The
next down count following the case where the contents of Timer/Counter equal the capture registers
will load an FFFFh into Timer/Counter 2. In either event a reload will set the TF2 bit. A reload will also
toggle the EXF2 bit. However, the EXF2 bit can not generate an interrupt while in this mode.
RL2
CP/
bit in T2CON is cleared
RCLK+TCLK=0,
RL2
CP/
=T2CON.0=0, DCEN=1
C/T = T2CON.1
0
1/4
1/12
T2M = CKCON.5
1
Down Counting Reload Value
0FFh
T2CON.7
Up Counting Reload Value
T2 = P1.0
T2CON.6
TR2 = T2CON.2
T2EX = P1.1
EXF2
Timer 2
Interrupt
TF2
TH2
TL2
RCAP2H
RCAP2L
0
1
0FFh
osc
16-Bit Auto-reload Up/Down Counter
Baud Rate Generator Mode
The baud rate generator mode is enabled by setting either the RCLK or TCLK bits in T2CON register.
While in the baud rate generator mode, Timer/Counter 2 is a 16 bit counter with auto reload when the
count rolls over from FFFFh. However, rolling-over does not set the TF2 bit. If EXEN2 bit is set, then a
negative transition of the T2EX pin will set EXF2 bit in the T2CON register and cause an interrupt
request.
RCLK+TCLK=0
C/T = T2CON.1
T2 = P1.0
T2CON.6
TR2 = T2CON.2
T2EX = P1.1
EXEN2 = T2CON.3
EXF2
Timer 2
overflow
Timer 2
Interrupt
TH2
TL2
RCAP2H
RCAP2L
0
1
osc
Baud Rate Generator Mode
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