H838532H datasheet(175/508 Pages) RENESAS

175 / 508 page

Section 6 ROM

Rev. 1.00 May 30, 2008 Page 155 of 484

REJ09B0436-0100

6.7.8

Programmer Mode Transition Time

Commands cannot be accepted during the oscillation stabilization period or the programmer mode

setup period. After the programmer mode setup time, a transition is made to memory read mode.

Table 6.18

Stipulated Transition Times to Command Wait State

Item

Symbol

Min

Max

Unit

Notes

Oscillation stabilization time (crystal oscillator)

osc1

—

Figure 6.14

Oscillation stabilization time (ceramic oscillator) T

osc1

—

Programmer mode setup time

bmv

—

Vcc hold time

dwn

—

tosc1

tbmv

tdwn

Vcc

RES

Auto-program mode

Auto-erase mode

Figure 6.14 Oscillation Stabilization Time, Boot Program Transfer Time,

and Power-Down Sequence

6.7.9

Notes on Memory Programming

1. When performing programming using programmer mode on a chip that has been

programmed/erased in an on-board programming mode, auto-erasing is recommended before

carrying out auto-programming.

2. The flash memory is initially in the erased state when the device is shipped by Renesas

Technology. For other chips for which the erasure history is unknown, it is recommended that

auto-erasing be executed to check and supplement the initialization (erase) level.

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