ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 112

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

PS027001-0707
Flash Address Upper Byte Register
The FLASH_ADDR_U register defines the upper 6 bits of the Flash memory address
space. Changing the value of FLASH_ADDR_U allows on-chip 256 KB Flash memory
to be mapped to any location within the 16 MB linear address space of the eZ80F91
device. If on-chip Flash memory is enabled, the Flash address assumes priority over any
external Chip Selects. The external Chip Select signals are not asserted if the corre-
sponding Flash address is enabled. Internal Flash memory does not hold priority over
internal SRAM. See
Table 37. Flash Address Upper Byte Register
Bit
Reset
CPU Access
Note: R/W = Read/Write; R = Read Only.
Bit Position
[7:2]
FLASH_ADDR_U
[1:0]
Value
00h–FCh These bits define the upper byte of the Flash address.
00
Table
R/W
37.
7
0
Description
When on-chip Flash is enabled, the Flash address space
begins at address {FLASH_ADDR_U, 00b, 0000h}. On-chip
Flash has priority over all external Chip Selects.
Reserved (enforces alignment on a 256 KB boundary).
R/W
6
0
R/W
5
0
R/W
4
0
(FLASH_ADDR_U = 00F7h)
R/W
3
0
Product Specification
R/W
2
0
eZ80F91 ASSP
R
1
0
Flash Memory
R
0
0
104