ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 75

• Manufacturer Part Number: ez80f92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Table 23. Chip Select x Upper Bound Register(CS0_UBR = 00A9h, CS1_UBR = 00ACh, CS2_UBR =
PS015313-0508
Chip Select x Upper Bound Register
For Memory Chip Selects, the Chip Select x Upper Bound registers, listed in
defines the upper bound of the address range for which the corresponding Chip Select (if
enabled) can be active. For I/O Chip Selects, this register produces no effect. The reset
state for the Chip Select 0 Upper Bound register is
Chip Select upper bound registers is
00AFh, CS3_UBR = 00B2h)
Bit
CS0_UBR Reset
CS1_UBR Reset
CS2_UBR Reset
CS3_UBR Reset
CPU Access
Note: R/W = Read/Write.
Bit
Position
[7:0]
CSx_UBR
Value Description
00h–
FFh
R/W
For Memory Chip Selects (CSx_IO = 0)
This byte specifies the upper bound of the Chip Select address
range. The upper byte of the address bus, ADDR[23:16], is
compared to the values contained in these registers for
determining whether a Chip Select signal should be generated.
For I/O Chip Selects (CSx_IO = 1)
No effect.
7
1
0
0
0
R/W
6
1
0
0
0
00h
.
R/W
5
1
0
0
0
FFh
R/W
4
1
0
0
0
, while the reset state for the other
R/W
3
1
0
0
0
Chip Selects and Wait States
Product Specification
R/W
2
1
0
0
0
eZ80F92/eZ80F93
R/W
1
1
0
0
0
Table
23,
R/W
0
1
0
0
0
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