ST72521 STMICROELECTRONICS [STMicroelectronics], ST72521 Datasheet - Page 68

• Manufacturer Part Number: ST72521
• Description: 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST72521
PWM AUTO-RELOAD TIMER (Cont’d)
INPUT CAPTURE
CONTROL / STATUS REGISTER (ARTICCSR)
Read /Write
Reset Value: 0000 0000 (00h)
Bit 7:6 = Reserved, always read as 0.
Bit 5:4 = CS[2:1] Capture Sensitivity
These bits are set and cleared by software. They
determine the trigger event polarity on the corre-
sponding input capture channel.
0: Falling edge triggers capture on channel x.
1: Rising edge triggers capture on channel x.
Bit 3:2 = CIE[2:1] Capture Interrupt Enable
These bits are set and cleared by software. They
enable or disable the Input capture channel inter-
rupts independently.
0: Input capture channel x interrupt disabled.
1: Input capture channel x interrupt enabled.
Bit 1:0 = CF[2:1] Capture Flag
These bits are set by hardware and cleared by
software reading the corresponding ARTICRx reg-
ister. Each CFx bit indicates that an input capture x
has occurred.
0: No input capture on channel x.
1: An input capture has occured on channel x.
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7
0
0
CS2
CS1
CIE2
CIE1
CF2
CF1
0
INPUT CAPTURE REGISTERS (ARTICRx)
Read only
Reset Value: 0000 0000 (00h)
Bit 7:0 = IC[7:0] Input Capture Data
These read only bits are set and cleared by hard-
ware. An ARTICRx register contains the 8-bit
auto-reload counter value transferred by the input
capture channel x event.
IC7
7
IC6
IC5
IC4
IC3
IC2
IC1
IC0
0