3069RF-ZTAT Datasheet, PDF (363/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

On-chip data bus
H
CPU L
Bus interface
H
L
Module
data bus
16TCNTH 16TCNTL
Figure 9.9 Access to Timer Counter L (CPU Reads 16TCNTL, Lower Byte)
9.3.2 8-Bit Accessible Registers
The registers other than the timer counters and general registers are 8-bit registers. These registers
are linked to the CPU by an internal 8-bit data bus.
Figures 9.10 and 9.11 show examples of byte read and write access to a 16TCR.
If a word-size data transfer instruction is executed, two byte transfers are performed.
On-chip data bus
H
CPU L
Bus interface
H
L
Module
data bus
16TCR
Figure 9.10 16TCR Access (CPU Writes to 16TCR)
On-chip data bus
H
CPU L
Bus interface
H
L
Module
data bus
16TCR
Figure 9.11 16TCR Access (CPU Reads 16TCR)
Rev. 5.0, 09/04, page 341 of 978