ez80l92 ZiLOG Semiconductor, ez80l92 Datasheet - Page 73

• Manufacturer Part Number: ez80l92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS013014-0107
Chip Select Registers
System Clock
ADDR[23:0]
DATA[7:0]
or IORQ
DTACK
MREQ
Switching Between Bus Modes
Each time the bus mode controller must switch from one bus mode to another, there is a
one-cycle eZ80 system clock delay. An extra clock cycle is not required for repeated
accesses in any of the bus modes; nor is it required when the eZ80L92 switches to eZ80
Bus Mode. The extra clock cycles are not shown in the timing examples. Due to the asyn-
chronous nature of these bus protocols, the extra delay does not impact peripheral commu-
nication.
Chip Select x Lower Bound Registers
For Memory Chip Selects, the Chip Select x Lower Bound register (see
the lower bound of the address range for which the corresponding Memory Chip Select (if
CSx
R/W
DS
AS
Figure 16. Motorola Bus Mode Write Timing Example
S0
S1
S2
S3
S4
S5
S6
Chip Selects and Wait States
Product Specification
S7
Table
eZ80L92 MCU
22) defines
67