參數(shù)資料
型號(hào): ST7PLITE02Y0B6
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP16
封裝: 0.300 INCH, PLASTIC, DIP-16
文件頁(yè)數(shù): 79/125頁(yè)
文件大?。?/td> 1956K
代理商: ST7PLITE02Y0B6
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ST7LITE0x, ST7LITESx
57/125
12-BIT AUTORELOAD TIMER (Cont’d)
11.2.6 Register Description
TIMER CONTROL STATUS REGISTER (ATC-
SR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:5 = Reserved, must be kept cleared.
Bit 4:3 = CK[1:0] Counter Clock Selection.
These bits are set and cleared by software and
cleared by hardware after a reset. They select the
clock frequency of the counter.
Bit 2 = OVF Overflow Flag.
This bit is set by hardware and cleared by software
by reading the ATCSR register. It indicates the
transition of the counter from FFFh to ATR value.
0: No counter overflow occurred
1: Counter overflow occurred
Caution:
When set, the OVF bit stays high for 1 fCOUNTER
cycle, (up to 1ms depending on the clock selec-
tion).
Bit 1 = OVFIE Overflow Interrupt Enable.
This bit is read/write by software and cleared by
hardware after a reset.
0: OVF interrupt disabled
1: OVF interrupt enabled
Bit 0 = CMPIE Compare Interrupt Enable.
This bit is read/write by software and clear by
hardware after a reset. It allows to mask the inter-
rupt generation when CMPF bit is set.
0: CMPF interrupt disabled
1: CMPF interrupt enabled
COUNTER REGISTER HIGH (CNTRH)
Read only
Reset Value: 0000 0000 (00h)
COUNTER REGISTER LOW (CNTRL)
Read only
Reset Value: 0000 0000 (00h)
Bits 15:12 = Reserved, must be kept cleared.
Bits 11:0 = CNTR[11:0] Counter Value.
This 12-bit register is read by software and cleared
by hardware after a reset. The counter is incre-
mented continuously as soon as a counter clock is
selected. To obtain the 12-bit value, software
should read the counter value in two consecutive
read operations. The CNTRH register can be in-
cremented between the two reads, and in order to
be accurate when fTIMER=fCPU, the software
should take this into account when CNTRL and
CNTRH are read. If CNTRL is close to its highest
value, CNTRH could be incremented before it is
read.
When a counter overflow occurs, the counter re-
starts from the value specified in the ATR register.
70
0
CK1
CK0
OVF
OVFIE CMPIE
Counter Clock Selection
CK1
CK0
OFF
0
fLTIMER (1 ms timebase @ 8 MHz)
0
1
fCPU
10
Reserved
1
15
8
0
CN11
CN10
CN9
CN8
70
CN7
CN6
CN5
CN4
CN3
CN2
CN1
CN0
1
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ST7PLITE02Y0M6TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI
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