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8.3
CPU Interface
8.3.1
16-Bit Accessible Registers
The timer counters (16TCNTs), general registers A and B (GRAs and GRBs) are 16-bit registers,
and are linked to the CPU by an internal 16-bit data bus. These registers can be written or read a
word at a time, or a byte at a time.
Figures 8.4 and 8.5 show examples of word read/write access to a timer counter (16TCNT).
Figures 8.6 to 8.9 show examples of byte read/write access to 16TCNTH and 16TCNTL.
On-chip data bus
CPU
H
L
Bus interface
H
L
Module
data bus
16TCNTH
16TCNTL
Figure 8.4 16TCNT Access Operation [CPU
→
16TCNT (Word)]
On-chip data bus
CPU
H
L
Bus interface
H
L
Module
data bus
16TCNTH
16TCNTL
Figure 8.5 Access to Timer Counter (CPU Reads 16TCNT, Word)
Summary of Contents for H8/3008
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