Output Compare Register 4 A Low and High byte

The OCR4AL and OCR4AH register pair represents the 16-bit value, OCR4A.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 Registers.

Name:
OCR4AL and OCR4AH
Offset:
0xA8
Reset:
0x00
Access:
-
Bit15141312111098
OCR4A[15:8]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000
Bit76543210
OCR4A[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000

Bits 15:0 – OCR4A[15:0]: Output Compare 4 A

Output Compare 4 A

The Output Compare Registers contain a 16-bit value that is continuously compared with the counter value (TCNT4). A match can be used to generate an Output Compare interrupt, or to generate a waveform output on the OC4A pin.

The Output Compare Registers are 16-bit in size. To ensure that both the high and low bytes are written simultaneously when the CPU writes to 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.