ST72T311 ST Microelectronics, ST72T311 Datasheet - Page 49

• Manufacturer Part Number: ST72T311
• Description: 8-BIT MCU WITH 8 TO 16K OTP/EPROM
• Manufacturer: ST Microelectronics

16-BIT TIMER (Cont’d)
STATUS REGISTER (SR)
Read Only
Reset Value: 0000 0000 (00h)
The three least significant bits are not used.
Bit 7 = ICF1 Input Capture Flag 1.
0: No input capture (reset value).
1: An input capture has occurred or the counter
Bit 6 = OCF1 Output Compare Flag 1.
0: No match (reset value).
1: The content of the free running counter has
Bit 5 = TOF Timer Overflow.
0: No timer overflow (reset value).
1: The free running counter rolled over from FFFFh
Note: Reading or writing the ACLR register does
not clear TOF.
Bit 4 = ICF2 Input Capture Flag 2.
0: No input capture (reset value).
1: An input capture has occurred.To clear this bit,
Bit 3 = OCF2 Output Compare Flag 2.
0: No match (reset value).
1: The content of the free running counter has
ICF1
has reached the OC2R value in PWM mode. To
clear this bit, first read the SR register, then read
or write the low byte of the IC1R (IC1LR) regis-
ter.
matched the content of the OC1R register. To
clear this bit, first read the SR register, then read
or write the low byte of the OC1R (OC1LR) reg-
ister.
to 0000h. To clear this bit, first read the SR reg-
ister, then read or write the low byte of the CR
(CLR) register.
first read the SR register, then read or write the
low byte of the IC2R (IC2LR) register.
matched the content of the OC2R register. To
clear this bit, first read the SR register, then read
or write the low byte of the OC2R (OC2LR) reg-
ister.
7
OCF1
TOF
ICF2
OCF2
0
0
0
0
Bit 2-0 = Reserved, forced by hardware to 0.
INPUT CAPTURE 1 HIGH REGISTER (IC1HR)
Read Only
Reset Value: Undefined
This is an 8-bit read only register that contains the
high part of the counter value (transferred by the
input capture 1 event).
INPUT CAPTURE 1 LOW REGISTER (IC1LR)
Read Only
Reset Value: Undefined
This is an 8-bit read only register that contains the
low part of the counter value (transferred by the in-
put capture 1 event).
OUTPUT
(OC1HR)
Read/Write
Reset Value: 1000 0000 (80h)
This is an 8-bit register that contains the high part
of the value to be compared to the CHR register.
OUTPUT
(OC1LR)
Read/Write
Reset Value: 0000 0000 (00h)
This is an 8-bit register that contains the low part of
the value to be compared to the CLR register.
MSB
MSB
MSB
MSB
7
7
7
7
COMPARE
COMPARE
ST72E311 ST72T311
1
1
HIGH
LOW
REGISTER
REGISTER
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LSB
LSB
LSB
LSB
0
0
0
0