h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 368

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 16-Bit Timer Pulse Unit (TPU)
10.3
10.3.1
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 10.2.
10.3.2
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.
Rev. 5.00 Sep 22, 2005 page 342 of 1136
REJ09B0257-0500
Bus
master
Figure 10.2 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
↔ TCNT (16 Bits)]
↔ ↔
TCNTL
Module
data bus