HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 359

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

9.3
9.3.1
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 9.2.
9.3.2
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 9.3 to 9.5.
Bus
master
Figure 9.2 16-Bit Register Access Operation [Bus Master
Interface to Bus Master
16-Bit Registers
8-Bit Registers
Internal data bus
H
L
Bus interface
TCNTH
Rev.3.00 Mar. 26, 2007 Page 317 of 772
Section 9 16-Bit Timer Pulse Unit (TPU)
TCNTL
TCNT (16 Bits)]
REJ09B0355-0300
Module
data bus