Interface To Bus Master; 16-Bit Registers - Renesas H8S Series Hardware Manual

10.3

Interface to Bus Master

10.3.1

16-Bit Registers

TCNT and TGR are 16-bit registers. As the data bus to the bus master is 16 bits wide, these registers can be read and
written to in 16-bit units.
These registers cannot be read or written to in 8-bit units; 16-bit access must always be used.
An example of 16-bit register access operation is shown in figure 10-2.
Internal data bus
Bus
master
Figure 10-2 16-Bit Register Access Operation [Bus Master ↔ TCNT (16 Bits)]
H
L Bus interface
TCNTH TCNTL
Rev.6.00 Oct.28.2004 page 369 of 1016
Module
data bus
REJ09B0138-0600H