Figure 10-11 Access to Timer Counter (CPU Reads TCNT, Lower Byte)
10.3.2 8-Bit Accessible Registers
The registers other than the timer counters, general registers, and buffer registers are 8-bit
registers. These registers are linked to the CPU by an internal 8-bit data bus.
Figures 10-12 and 10-13 show examples of byte read and write access to a TCR.
If a word-size data transfer instruction is executed, two byte transfers are performed.
Figure 10-12 Access to Timer Counter (CPU Writes to TCR)
On-chip data bus
CPU
H
L
Bus interface
H
L
Module
data bus
TCNTH
TCNTL
On-chip data bus
CPU
H
L
Bus interface
H
L
Module
data bus
TCR
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