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9.3
CPU Interface
9.3.1
8-Bit Registers
8TCNT, TCORA, TCORB, 8TCR, and 8TCSR are 8-bit registers. These registers are connected
to the CPU by an internal 16-bit data bus and can be read and written a word at a time or a byte at
a time.
Figures 9.2 and 9.3 show the operation in word read and write accesses to 8TCNT.
Figures 9.4 to 9.7 show the operation in byte read and write accesses to 8TCNT0 and 8TCNT1.
8TCNT0 8TCNT1
H
L
H
L
C
P
U
Internal data bus
Bus
interface
Module data bus
Figure 9.2 8TCNT Access Operation (CPU Writes to 8TCNT, Word)
8TCNT0 8TCNT1
H
L
H
L
C
P
U
Internal data bus
Bus
interface
Module data bus
Figure 9.3 8TCNT Access Operation (CPU Reads 8TCNT, Word)
8TCNTH0 8TCNTL1
H
L
H
L
C
P
U
Internal data bus
Bus
interface
Module data bus
Figure 9.4 8TCNT0 Access Operation (CPU Writes to 8TCNT0, Upper Byte)
Содержание H8/3008
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