HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 345

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

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.
CPU
CPU
On-chip data bus
On-chip data bus
Figure 10-11 Access to Timer Counter (CPU Reads TCNT, Lower Byte)
H
L
H
L
Figure 10-12 Access to Timer Counter (CPU Writes to TCR)
Bus interface
Bus interface
333
TCNTH
TCR
TCNTL
H
L
H
L
Module
data bus
Module
data bus