EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 64

• Manufacturer Part Number: EZ80F920120MOD
• Description: MODULE EZ80F92 512K 20MHZ
• Manufacturer: Zilog

Specifications of EZ80F920120MOD

• Module/board Type: Development Module
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 MB
• Interface Type: Cable
• Maximum Clock Frequency: 20 MHz
• Operating Supply Voltage: 0 V to 3.3 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: 0 C
• For Use With/related Products: eZ80F92
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3157; EZ80F920120MOD

Table 13. Register Values for Memory Chip Select Example in Figure 6
PS015308-0404
Chip
Select
CS0
CS1
CS2
CS3
I/O Chip Select Operation
CSx_CTL[3]
CSx_EN
1
1
1
1
I/O Chip Selects can only be active when the CPU is performing I/O instructions. Because
the I/O space is separate from the memory space in the eZ80F92 device, there can never be
a conflict between I/O and memory addresses.
The eZ80F92 device supports a 16-bit I/O address. The I/O Chip Select logic decodes the
High byte of the I/O address, ADDR[15:8]. Because the upper byte of the address bus,
ADDR[23:16], is ignored, the I/O devices can always be accessed from within any mem-
ory mode (ADL or Z80). The MBASE offset value used for setting the Z80 MEMORY
mode page is also always ignored.
Four I/O Chip Selects are available with the eZ80F92 device. To generate a particular I/O
Chip Select, the following conditions must be met:
•
•
•
•
•
•
The Chip Select is enabled by setting CSX_EN to 1
The Chip Select is configured for I/O by setting CSX_IO to 1
An I/O Chip Select address match occurs—ADDR[15:8] = CSx_LBR[7:0]
No higher-priority (lower-number) Chip Select meets the above conditions
The I/O address is not within the on-chip peripheral address range
On-chip peripheral registers assume priority for all addresses where:
0080h ADDR[15:0]
An I/O instruction must be executing
CSx_CTL[4]
CSx_IO
0
0
0
0
CSx_LBR CSx_UBR Description
A0h
D0h
00h
00h
00FFh
P R E L I M I N A R Y
CFh
FFh
7Fh
9Fh
CS0 is enabled as a Memory Chip Select.
Valid addresses range from 000000h–
7FFFFFh.
CS1 is enabled as a Memory Chip Select.
Valid addresses range from 800000h–
9FFFFFh.
CS2 is enabled as a Memory Chip Select.
Valid addresses range from A00000h–
CFFFFFh.
CS3 is enabled as a Memory Chip Select.
Valid addresses range from D00000h–
FFFFFFh.
Chip Selects and Wait States
Product Specification
eZ80F92/eZ80F93
0080h–00FFh
.
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