ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 98

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

PS027001-0707
Table 31. eZ80F91 Pin Status During Bus Acknowledge Cycles
Normal bus operation of the eZ80F91 device using CS0 to communicate to an external
peripheral is illustrated in
nal bus master communicating with an external peripheral during bus acknowledge cycles.
Pin Symbol
ADDR23..ADDR0
CS0
CS1
CS2
CS3
DATA7..0
IORQ
MREQ
RD
WR
INSTRD
Signal Direction
Input
Output
Output
Output
Output
Tristate
Input
Input
Tristate
Tristate
Tristate
Figure 20
on page 91.
Description
Allows external bus master to utilize the chip
select logic of the eZ80F91.
Normal operation.
Normal operation.
Normal operation.
Normal operation.
Allows external bus master to communicate
with external peripherals.
Allows external bus master to utilize the chip
select logic of the eZ80F91.
Allows external bus master to utilize the chip
select logic of the eZ80F91.
Allows external bus master to communicate
with external peripherals.
Allows external bus master to communicate
with external peripherals.
Allows external bus master to communicate
with external peripherals.
Figure 21
on page 91 illustrates an exter-
Chip Selects and Wait States
Product Specification
eZ80F91 ASSP
90