ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 81

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

eZ80F91 ASSP
Product Specification
73
T1
T2
T
T3
CLK
System Clock
ADDR[23:0]
DATA[7:0]
CSx
RD
WAIT
WR
MREQ
or IORQ
Figure 11. Example: Z80 Bus Mode Write Timing
Intel Bus Mode
Chip selects configured for Intel bus mode modify the CPU bus signals to duplicate a
four-state memory transfer similar to that found on Intel-style microcontrollers. The bus
signals and eZ80F91 pins are mapped as illustrated in
Figure 12
on page 74. In Intel bus
mode, you select either multiplexed or nonmultiplexed address and data buses. In
nonmultiplexed operation, the address and data buses are separate. In multiplexed
operation, the lower byte of the address, ADDR[7:0], also appears on the data bus,
DATA[7:0], during State T1 of the Intel bus mode cycle.
PS027001-0707
Chip Selects and Wait States