EZ80F91MCU Datasheet, PDF (137/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
118
Flash Page Select Register
The msb of this register is used to select whether I/O Flash access and PAGE
ERASE operations are directed to the 512-byte information page or to the main
Flash memory array. The lower 7 bits are used to select one of the main 128
pages for PAGE ERASE or I/O operations.
To perform a PAGE ERASE, the software must set the proper page value prior to
setting the page erase bit in the Flash Control Register. In addition, each access
to the FLASH_DATA register causes an autoincrement of the Flash address
stored in the Flash Address registers (FLASH_PAGE, FLASH_ROW,
FLASH_COL). See Table 42.
Table 42. Flash Page Select Register
(FLASH_PAGE = 00FCh)
Bit
7
6
Reset
0
0
CPU Access
R/W R/W
Note: R/W = Read/Write, R = Read Only.
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
Bit
Position
Value Description
[7]
INFO_EN
0
Flash I/O access to main Flash memory.
1
Flash I/O access to the information page. PAGE ERASE and
MASS ERASE operations only affect the information page.
[6:0]
00h– Page address of Flash memory to be used during the PAGE
FLASH_PAGE FFh ERASE or I/O access of main Flash memory. When INFO_EN
is set to 1, this field is ignored.
PS019209-0504
PRELIMINARY
Flash Memory