參數(shù)資料
型號： C8051F2XX
廠商： Electronic Theatre Controls, Inc.
英文描述： Mixed Signal 8 kB ISP Flash MCU Family
中文描述： 混合信號8 KB的閃存MCU系列的ISP
文件頁數(shù)： 133/146頁
文件大?。?/td> 1856K
代理商： C8051F2XX
C8051F2xx
Rev. 1.6
133
17.2. Timer 2
Timer 2 is a 16-bit counter/timer formed by the two 8-bit SFR's: TL2 (low byte) and TH2 (high byte). As
with Timers 0 and 1, Timer 2 can use either the system clock or transitions on an external input pin as its
clock source. The Counter/Timer Select bit C/T2 bit (T2CON.1) selects the clock source for Timer 2.
Clearing C/T2 selects the system clock as the input for the timer (divided by either one or twelve as speci-
fied by the Timer Clock Select bit T2M in CKCON). When C/T2 is set to 1, high-to-low transitions at the T2
input pin increment the counter/timer register. (Refer to Section 14 for information on selecting and config-
uring external I/O pins.) Timer 2 can also be used to start an ADC Data Conversion (see section 5).
Timer 2 offers capabilities not found in Timer 0 and Timer 1. It operates in one of three modes: 16-bit
Counter/Timer with Capture, 16-bit Counter/Timer with Auto-Reload or Baud Rate Generator Mode. Timer
2's operating mode is selected by setting configuration bits in the Timer 2 Control (T2CON) register. Below
is a summary of the Timer 2 operating modes and the T2CON bits used to configure the counter/timer.
Detailed descriptions of each mode follow.
RCLK
0
0
0
1
1
X
TCLK
0
0
1
0
1
X
CP/RL2
1
0
X
X
X
X
TR2
1
1
1
1
1
0
Mode
16-bit Counter/Timer with Capture
16-bit Counter/Timer with Auto-Reload
Baud Rate Generator for TX
Baud Rate Generator for RX
Baud Rate Generator for TX and RX
Off
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