參數(shù)資料
型號： W77LE58P-25
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, 25 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 24/81頁
文件大小： 657K
代理商： W77LE58P-25
Preliminary W77LE58
- 24 -
Timer 2 Control
Bit:
7
6
5
4
3
2
1
0
TF2
EXF2
RCLK
TCLK
EXEN2
TR2
C/ 2
CP RL
/
2
Mnemonic: T2CON
Address: C8h
TF2:
Timer 2 overflow flag: This bit is set when Timer 2 overflows. It is also set when the count is
equal to the capture register in down count mode. It can be set only if RCLK and TCLK are
both 0. It is cleared only by software. Software can also set or clear this bit.
EXF2: Timer 2 External Flag: A negative transition on the T2EX pin (P1.1) or timer 2 overflow will
cause this flag to set based on the CP RL
/
transition, this flag must be cleared by software. Setting this bit in software or detection of a
negative transition on T2EX pin will force a timer interrupt if enabled.
2, EXEN2 and DCEN bits. If set by a negative
RCLK: Receive Clock Flag: This bit determines the serial port 0 time-base when receiving data in
serial modes 1 or 3. If it is 0, then timer 1 overflow is used for baud rate generation, otherwise
timer 2 overflow is used. Setting this bit forces timer 2 in baud rate generator mode.
TCLK: Transmit Clock Flag: This bit determines the serial port 0 time-base when transmitting data in
modes 1 and 3. If it is set to 0, the timer 1 overflow is used to generate the baud rate clock
otherwise timer 2 overflow is used. Setting this bit forces timer 2 in baud rate generator mode.
EXEN2: Timer 2 External Enable. This bit enables the capture/reload function on the T2EX pin if
Timer 2 is not generating baud clocks for the serial port. If this bit is 0, then the T2EX pin will
be ignored, otherwise a negative transition detected on the T2EX pin will result in capture or
reload.
TR2:
Timer 2 Run Control. This bit enables/disables the operation of timer 2. Clearing this bit will
halt the timer 2 and preserve the current count in TH2, TL2.
C T
/
2 : Counter/Timer Select. This bit determines whether timer 2 will function as a timer or a
counter.
Independent of this bit, the timer will run at 2 clocks per tick when used in baud rate generator
mode. If it is set to 0, then timer 2 operates as a timer at a speed depending on T2M bit
(CKCON.5), otherwise it will count negative edges on T2 pin.
CP RL
/
2:Capture/Reload Select. This bit determines whether the capture or reload function will be
used for timer 2. If either RCLK or TCLK is set, this bit will be ignored and the timer will
function in an auto-reload mode following each overflow. If the bit is 0 then auto-reload will
occur when timer 2 overflows or a falling edge is detected on T2EX pin if EXEN2 = 1. If this
bit is 1, then timer 2 captures will occur when a falling edge is detected on T2EX pin if EXEN2
= 1.
Timer 2 Mode Control
Bit:
7
6
5
4
3
2
1
0
HC5
HC4
HC3
HC2
T2CR
-
T2OE
DCEN
Mnemonic: T2MOD
Address: C9h
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