H838532H datasheet(255/508 Pages) RENESAS

Part #	H838532H

Description	16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series

PDF	508 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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255 / 508 page

Section 9 Timers

Rev. 1.00 May 30, 2008 Page 235 of 484

REJ09B0436-0100

9.4.3

CPU Interface

TCF and OCRF are 16-bit read/write registers, but the CPU is connected to the on-chip peripheral

modules by an 8-bit data bus. When the CPU accesses these registers, it therefore uses an 8-bit

temporary register (TEMP).

In 16-bit mode, TCF read/write access and OCRF write access must be performed 16 bits at a time

(using two consecutive byte-size MOV instructions), and the upper byte must be accessed before

the lower byte. Data will not be transferred correctly if only the upper byte or only the lower byte

is accessed.

In 8-bit mode, there are no restrictions on the order of access.

(1) Write Access

Write access to the upper byte results in transfer of the upper-byte write data to TEMP. Next, write

access to the lower byte results in transfer of the data in TEMP to the upper register byte, and

direct transfer of the lower-byte write data to the lower register byte.

H838532H Datasheet(PDF) 255 Page - Renesas Technology Corp