H8SXSLASH1663 datasheet(943/1158 Pages) RENESAS

943 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 891 of 1102

REJ09B0294-0100

21.6.2

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 power-on reset or a transition to software standby mode.

Since registers of the CPU except for R0 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 21.4 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 21.4

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

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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