SH7616 Datasheet, PDF (733/935 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series

17.3 Interface to Bus Master
Section 17 16-Bit Timer Pulse Unit (TPU)
17.3.1 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 17.2.
Internal data bus
H
Bus
master ^L
Bus interface
Module
data bus
TCNTH
TCNTL
Figure 17.2 16-Bit Register Access Operation [Bus Master ↔ TCNT (16 Bits)]
17.3.2 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.
Rev. 2.00 Mar 09, 2006 page 707 of 906
REJ09B0292-0200