H8SLASH3028F datasheet(601/923 Pages) RENESAS

部件名	H8/3028F

功能描述	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	923 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

标志

601 / 923 page

Rev. 2.00, 09/03, page 571 of 890

17.3

Operation

When the RAME bit is set to 1, the on-chip RAM is enabled. Accesses to addresses H'FBF20 to

H'FFF1F in modes 1, 2, and 7, and to addresses H'FFBF20 to H'FFFF1F in the H8/3028 Group in

modes 3, 4, and 5, and to addresses H'7F20 to H'FF1F in mode 6, are directed to the on-chip

RAM. In modes 1 to 5 (expanded modes), when the RAME bit is cleared to 0, the off-chip address

space is accessed. In modes 6 and 7 (single-chip mode), when the RAME bit is cleared to 0, the

on-chip RAM is not accessed: read access always results in H'FF data, and write access is ignored.

Since the on-chip RAM is connected to the CPU by an internal 16-bit data bus, it can be written

and read by word access. It can also be written and read by byte access. Byte data is accessed in

two states using the upper 8 bits of the data bus. Word data starting at an even address is accessed

in two states using all 16 bits of the data bus.

H8/3028F 数据表(PDF) 601 Page - Renesas Technology Corp