H8S2245 datasheet(359/818 Pages) RENESAS

Part #	H8S2245

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

PDF	818 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 9 16-Bit Timer Pulse Unit (TPU)

Rev.3.00 Mar. 26, 2007 Page 317 of 772

REJ09B0355-0300

9.3

Interface to Bus Master

9.3.1

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 9.2.

Bus interface

Internal data bus

Bus

master

Module

data bus

TCNTH

TCNTL

Figure 9.2 16-Bit Register Access Operation [Bus Master

↔

↔ TCNT (16 Bits)]

9.3.2

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 9.3 to 9.5.

H8S2245 Datasheet(PDF) 359 Page - Renesas Technology Corp