EZ80F91MCU Datasheet, PDF (94/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
75
CS3_UBR = FFh
CS3_LBR = D0h
CS2_UBR = CFh
CS2_LBR = A0h
CS1_UBR = 9Fh
CS0_UBR = 7Fh
CS3 Active
3 MB Address Space
CS2 Active
3 MB Address Space
CS1 Active
2 MB Address Space
Memory
Location
FFFFFFh
D00000h
CFFFFFh
A00000h
9FFFFFh
800000h
7FFFFFh
CS0 Active
8 MB Address Space
CS0_LBR = CS1_LBR = 00h
Figure 6. Example: Memory Chip Select
000000h
Table 17. Example: Register Values for Figure 6 Memory Chip Select
Chip
Select
CS0
CS1
CS2
CS3
CSx_CTL[3] CSx_CTL[4]
CSx_EN CSx_IO CSx_LBR
1
0
00h
1
0
00h
1
0
A0h
1
0
D0h
CSx_UBR Description
7Fh CS0 is enabled as a Memory Chip
Select. Valid addresses range from
000000h–7FFFFFh.
9Fh CS1 is enabled as a Memory Chip
Select. Valid addresses range from
800000h–9FFFFFh.
CFh CS2 is enabled as a Memory Chip
Select. Valid addresses range from
A00000h–CFFFFFh.
FFh CS3 is enabled as a Memory Chip
Select. Valid addresses range from
D00000h–FFFFFFh.
PS019209-0504
PRELIMINARY
Chip Selects and Wait States