參數(shù)資料
型號： 8XC51
廠商： Intel Corp.
英文描述： CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
中文描述： CHMOS單片8位微控制器
文件頁數(shù)： 13/58頁
文件大?。?/td> 233K
代理商： 8XC51
2003 Oct 30
13
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
8.2
Timer 2 operation
Timer 2 is a 16-bit timer and counter which can operate as either an event timer or an event counter, as selected by bit
C/T2 in the special function register T2CON. Timer 2 has three operating modes: capture, auto-reload (up-or down
counting), and baud rate generator, which are selected by bits in register T2CON.
8.2.1
T
IMER
/
COUNTER
2 C
ONTROL REGISTER
(T2CON)
Table 4
Timer/counter 2 control register bits
Table 5
Description of register bits
Table 6
Timer 2 operating modes
BIT
7
6
5
4
3
2
1
0
Symbol
TF2
EXF2
RCLK
TCLK
EXEN2
TR2
C/T2
CP/RL2
BIT
SYMBOL
DESCRIPTION
7
TF2
Timer 2 overflow flag.
Set by a timer 2 overflow and must be cleared by software. TF2
will not be set when either RCLK = 1 or TCLK = 1.
Timer 2 external flag.
Set when either a capture or reload is caused by a negative
transition on controller input T2EX and EXEN2 = 1. When timer 2 interrupt is enabled,
EXF2 = 1 will cause the CPU to vector to the timer 2 interrupt routine. EXF2 must be
cleared by software. EXF2 does not cause an interrupt in up- or down-counter mode
(DCEN = 1).
Receive clock flag.
When set, causes the serial port to use timer 2 overflow pulses for
its receive clock in modes 1 and 3. When reset, causes timer 1 overflow to be used for
the receive clock.
Transmit clock flag.
When set, causes the serial port to use timer 2 overflow pulses for
its transmit clock in modes 1 and 3. When reset, causes timer 1 overflows to be used for
the transmit clock.
Timer 2 external enable flag.
When set, allows a capture or reload to occur as a result
of a negative transition on T2EX if timer 2 is not being used to clock the serial port. When
reset, causes timer 2 to ignore events at T2EX.
Start/stop control for timer 2.
TR2 = 1 starts the timer.
Counter or Timer select timer 2.
If C/T2 = 0 the internal timer at
1
/
12
f
XTAL1
is selected;
C/T2 = 1 selects the external event counter (falling edge triggered).
Capture or reload flag.
When set, captures will occur on negative transitions at T2EX if
EXEN2 = 1. When reset, auto-reloads will occur either with timer 2 overflows or negative
transitions at T2EX when EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this bit is
ignored and the timer is forced to auto-reload on timer 2 overflow.
6
EXF2
5
RCLK
4
TCLK
3
EXEN2
2
1
TR2
C/T2
0
CP/RL2
MODE
RCLK AND TCLK
CP/RL2
TR2
16-bit auto-reload
Baud rate generator
Off
0
1
X
0
X
X
1
1
0
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