H8SXSLASH1663M datasheet(1157/1504 Pages) RENESAS

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Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1125 of 1468

REJ09B0412-0200

25.7.2

Programming/Erasing Interface Parameters

The programming/erasing interface parameters specify the operating frequency, storage place for

program data, start address of programming destination, and erase block number, and exchanges

the execution result. These parameters use the general registers of the CPU (ER0 and ER1) or the

on-chip RAM area. The initial values of programming/erasing interface parameters are undefined

at a reset or a transition to software standby mode.

Since registers of the CPU except for ER0 and ER1 are saved in the stack area during download of

an on-chip program, initialization, programming, or erasing, allocate the stack area before

performing these operations (the maximum stack size is 128 bytes). The return value of the

processing result is written in R0. The programming/erasing interface parameters are used in

download control, initialization before programming or erasing, programming, and erasing. Table

25.4 shows the usable parameters and target modes. The meaning of the bits in the flash pass and

fail result parameter (FPFR) varies in initialization, programming, and erasure.

Table 25.4

Parameters and Target Modes

Parameter

Download

Initialization

Programming

Erasure

R/W

Initial

Value

Allocation

DPFR



R/W

Undefined

On-chip RAM*

FPFR

R/W

Undefined

R0L of CPU

FPEFEQ



R/W

Undefined

ER0 of CPU

FMPAR



R/W

Undefined

ER1 of CPU

FMPDR



R/W

Undefined

ER0 of CPU

FEBS



R/W

Undefined

ER0 of CPU

Note:

A single byte of the start address of the on-chip RAM specified by FTDAR

(a)

Download Control

The on-chip program is automatically downloaded by setting the SCO bit in FCCS to 1. The on-

chip RAM area to download the on-chip program is the 4-Kbyte area starting from the start

address specified by FTDAR. Download is set by the programming/erasing interface registers, and

the download pass and fail result parameter (DPFR) indicates the return value.

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