SH7052 datasheet(798/919 Pages) RENESAS

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21.10

Note on Flash Memory Programming/Erasing

In the on-board programming modes (user mode and user program mode), NMI input should be

disabled to give top priority to the program/erase operations (including RAM emulation).

When reading flash memory after changing the SWE1 bit from 1 to 0 on completion of a

program/erase operation, wait for at least t

CSWE after clearing SWE1 to 0 before executing the flash

memory read. Regarding the timing of

RES input after changing the SWE1 bit from 1 to 0 on

completion of a program/erase operation, wait for at least t

CSWE after clearing SWE1 to 0 before

executing the reset operation.

21.11

Flash Memory Programmer Mode

Programs and data can be written and erased in programmer mode as well as in the on-board

programming modes. In programmer mode, flash memory read mode, auto-program mode, auto-

erase mode, and status read mode are supported. In auto-program mode, auto-erase mode, and

status read mode, a status polling procedure is used, and in status read mode, detailed internal

signals are output after execution of an auto-program or auto-erase operation.

In programmer mode, set the mode pins to programmer mode (see table 21.12) and input a 6 MHz

input clock, so that the SH7054F runs at 24 MHz.

Table 21.12 shows the pin settings for programmer mode. For the pin names in programmer mode,

see section 1.3.2, Pin Functions.

Table 21.12 PROM Mode Pin Settings

Pin Names

Settings

Mode pins: MD2, MD1, MD0

0, 1, 1

FWE pin

High level input (in auto-program and auto-erase

modes)

RES pin

Power-on reset circuit

XTAL, EXTAL, PLLV

CC, PLLCAP,

PLLV

SS pins

Oscillator circuit

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