參數(shù)資料
型號(hào)： ST72324BLK4BA/XXX
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封裝： 0.400 INCH, PLASTIC, SDIP-32
文件頁(yè)數(shù)： 116/151頁(yè)
文件大?。?/td> 1209K
代理商： ST72324BLK4BA/XXX
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ST72F324L, ST72324BL
67/151
16-BIT TIMER (Cont’d)
CONTROL REGISTER 2 (CR2)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7 = OC1E Output Compare 1 Pin Enable.
This bit is used only to output the signal from the
timer on the OCMP1 pin (OLV1 in Output Com-
pare mode, both OLV1 and OLV2 in PWM and
one-pulse mode). Whatever the value of the OC1E
bit, the Output Compare 1 function of the timer re-
mains active.
0: OCMP1 pin alternate function disabled (I/O pin
free for general-purpose I/O).
1: OCMP1 pin alternate function enabled.
Bit 6 = OC2E Output Compare 2 Pin Enable.
This bit is used only to output the signal from the
timer on the OCMP2 pin (OLV2 in Output Com-
pare mode). Whatever the value of the OC2E bit,
the Output Compare 2 function of the timer re-
mains active.
0: OCMP2 pin alternate function disabled (I/O pin
free for general-purpose I/O).
1: OCMP2 pin alternate function enabled.
Note: In Flash devices, this bit is not available for
Timer A. It must be kept at its reset value.
Bit 5 = OPM One Pulse Mode.
0: One Pulse Mode is not active.
1: One Pulse Mode is active, the ICAP1 pin can be
used to trigger one pulse on the OCMP1 pin; the
active transition is given by the IEDG1 bit. The
length of the generated pulse depends on the
contents of the OC1R register.
Bit 4 = PWM Pulse Width Modulation.
0: PWM mode is not active.
1: PWM mode is active, the OCMP1 pin outputs a
programmable cyclic signal; the length of the
pulse depends on the value of OC1R register;
the period depends on the value of OC2R regis-
ter.
Bit 3, 2 = CC[1:0] Clock Control.
The timer clock mode depends on these bits:
Table 16. Clock Control Bits
Note: If the external clock pin is not available, pro-
gramming the external clock configuration stops
the counter.
Bit 1 = IEDG2 Input Edge 2.
This bit determines which type of level transition
on the ICAP2 pin will trigger the capture.
0: A falling edge triggers the capture.
1: A rising edge triggers the capture.
Bit 0 = EXEDG External Clock Edge.
This bit determines which type of level transition
on the external clock pin EXTCLK will trigger the
counter register.
0: A falling edge triggers the counter register.
1: A rising edge triggers the counter register.
70
OC1E OC2E OPM PWM CC1 CC0 IEDG2 EXEDG
Timer Clock
CC1
CC0
fCPU / 4
0
fCPU / 2
0
1
fCPU / 8
1
0
External Clock (where
available)
11
1
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