參數(shù)資料
型號(hào): MC68HC705V8B
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封裝: SDIP-56
文件頁數(shù): 163/172頁
文件大?。?/td> 890K
代理商: MC68HC705V8B
SECTION 11: 16-BIT TIMER
MOTOROLA
Page 79
MC68HC705V8 Specification Rev. 2.1
11.4.6
OLVL - Output Level
Value of output level is clocked into output level register by the next successful
output compare and will appear on the TCMP pin
1 - High output
0 - Low output
11.5
TIMER STATUS REGISTER (TSR) - $13
The TSR is a read-only register containing three status flag bits.
Figure 11-4:
Timer Status Register - $13
11.5.1
ICF - Input Capture Flag
1 - Flag set when selected polarity edge is sensed by input capture edge
detector
0 - Flag cleared when TSR and input capture low register ($15) are accessed
Reset clears this bit.
11.5.2
OCF - Output Compare Flag
1 - Flag set when output compare register contents match the free-running
counter contents
0 - Flag cleared when TSR and output compare low register ($17) are
accessed
Reset clears this bit.
11.5.3
TOF - Timer Overflow Flag
1 - Flag set when free-running counter transition from $FFFF to $0000 occurs
0 - Flag cleared when TSR and counter low register ($19) are accessed
Reset clears this bit.
11.5.4
Bits 0-4 - Not used
Always read zero.
Accessing the timer status register satisfies the first condition required to clear status bits.
The remaining step is to access the register corresponding to the status bit.
A problem can occur when using the timer overflow function and reading the free-running
counter at random times to measure an elapsed time. Without incorporating the proper
precautions into software, the timer overflow flag could unintentionally be cleared if:
1. The timer status register is read or written when TOF is set, and
2. The MSB of the free-running counter is read but not for the purpose of
servicing the flag.
ICF
OCF
TOF
00000
RESET
$13
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0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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