Datasheet

Rev.6.00 Oct.28.2004 page 370 of 1016
REJ09B0138-0600H
10.3.2 8-Bit Registers
Registers other than TCNT and TGR are 8-bit. As the data bus to the CPU is 16 bits wide, these registers can be read and
written to in 16-bit units. They can also be read and written to in 8-bit units.
Examples of 8-bit register access operation are shown in figures 10-3 to 10-5.
Bus interface
H
Internal data bus
L
Module
data bus
TCR
Bus
master
Figure 10-3 8-Bit Register Access Operation [Bus Master TCR (Upper 8 Bits)]
Bus interface
H
Internal data bus
L
Module
data bus
TMDR
Bus
master
Figure 10-4 8-Bit Register Access Operation [Bus Master TMDR (Lower 8 Bits)]
Bus interface
H
Internal data bus
L
Module
data bus
TCR TMDR
Bus
master
Figure 10-5 8-Bit Register Access Operation [Bus Master TCR and TMDR (16 Bits)]