D12320VF25V Datasheet, PDF (783/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.28.2 PROM Mode Operation
Table 17.57 shows the settings for the operating modes of PROM mode, and table 17.58 lists the
commands used in PROM mode. The following sections provide detailed information on each
mode.
• Memory-read mode: This mode supports reading, in units of bytes, from the user MAT or user
boot MAT.
• Auto-program mode: This mode supports the simultaneous programming of the user MAT and
user boot MAT in 128-byte units. Status polling is used to confirm the end of automatic
programming.
• Auto-erase mode: This mode only supports the automatic erasing of the entire user MAT or
user boot MAT. Status polling is used to confirm the end of automatic erasing.
• Status-read mode: Status polling is used with automatic programming and automatic erasure.
Normal completion can be detected by reading the signal on the I/O₆ pin. In status-read mode,
error information is output when an error has occurred.
Table 17.57 Settings for Each Operating Mode of PROM Mode
Mode
Pin Name
CE
OE
WE
I/O7 to 0
A18 to 0
Read
L
L
H
Data output Ain
Output disable
L
H
H
Hi-Z
X
Command write
L
H
L
Data input Ain^*2
Chip disable^*1
H
X
X
Hi-Z
X
Notes: 1. The chip-disable mode is not a standby state; internally, it is an operational state.
2. Ain indicates that there is also an address input in auto-program mode.
Rev.7.00 Feb. 14, 2007 page 749 of 1108
REJ09B0089-0700