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The 16-bit timer has a single 8-bit register for temporary storing of the
High byte of the 16-bit access. The same temporary register is shared between all 16-bit
registers within the 16-bit timer. Accessing the Low byte triggers the 16-bit read or write
operation. When the Low byte of a 16-bit register is written by the CPU, the High byte
stored in the temporary register, and the Low byte written are both copied into the 16-bit
register in the same clock cycle. When the Low byte of a 16-bit register is read by the
CPU, the High byte of the 16-bit register is copied into the temporary register in the
same clock cycle as the Low byte is read.
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