8-bit AVR Microcontrollers

Input Capture Register 4 Low and High byte

The ICR4L and ICR4H register pair represents the 16-bit value, ICR4. The low byte [7:0] (suffix L) is accessible at the original offset. The high byte [15:8] (suffix H) can be accessed at offset + 0x01. For more details on reading and writing 16-bit registers, refer to Accessing 16-bit Timer/Counter Registers.

Name:
ICR4L and ICR4H
Offset:
0xA6
Reset:
0x00
Access:
-
Bit15141312111098
ICR4[15:8]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000
Bit76543210
ICR4[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000

Bits 15:0 – ICR4[15:0]: Input Capture 3

Input Capture 3

The Input Capture is updated with the counter (TCNT4) value each time an event occurs on the ICP4 pin (or optionally on the Analog Comparator output for Timer/Counter4). The Input Capture can be used for defining the counter TOP value.

The Input Capture Register is 16-bit in size. To ensure that both the high and low bytes are read simultaneously when the CPU accesses these registers, the access is performed using an 8-bit temporary High Byte Register (TEMP). This temporary register is shared by all the other 16-bit registers. Refer to Accessing 16-bit Timer/Counter Registers for details.