HD64F3039F18 Datasheet, PDF (255/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 8 16-Bit Integrated Timer Unit (ITU)
8.3.2 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 8.12 and 8.13 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.
Internal data bus
H
CPU L
Bus interface
H
L
Module
data bus
TCR
Figure 8.12 TCR Access (CPU Writes to TCR)
Internal data bus
H
CPU L
Bus interface
H
L
Module
data bus
TCR
Figure 8.13 TCR Access (CPU Reads TCR)
Rev.3.00 Mar. 26, 2007 Page 231 of 682
REJ09B0353-0300