H8SXSLASH1663M datasheet(112/1504 Pages) RENESAS

112 / 1504 page

Section 3 MCU Operating Modes

Rev. 2.00 Sep. 24, 2008 Page 80 of 1468

REJ09B0412-0200

Modes 1 and 2 are the user boot mode and the boot mode, respectively, in which the flash memory

can be programmed and erased. For details on the user boot mode and boot mode, see section 25,

Flash Memory.

Mode 3 is the boundary scan function enabled single-chip mode. For details on the boundary scan

function, see section 26, Boundary Scan.

Mode 7 is a single-chip initiation mode. All I/O ports can be used as general input/output ports.

The external address space cannot be accessed in the initial state, but setting the EXPE bit in the

system control register (SYSCR) to 1 enables to use the external address space. After the external

address space is enabled, ports D, E, and F can be used as an address output bus and ports H and I

as a data bus by specifying the data direction register (DDR) for each port. When the external

address space is not in use, ports J and K can be used by setting the PCJKE bit in the port function

control register D (PFCRD) to 1.

Modes 4 to 6 are external extended modes, in which the external memory and devices can be

accessed. In the external extended modes, the external address space can be designated as 8-bit or

16-bit address space for each area by the bus controller after starting program execution.

If 16-bit address space is designated for any one area, it is called the 16-bit bus widths mode. If 8-

bit address space is designated for all areas, it is called the 8-bit bus width mode.

H8SX/1663M データシート(PDF) 112 Page - Renesas Technology Corp