ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 90
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ez80f91
Manufacturer Part Number
ez80f91
Description
Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
Manufacturer
ZiLOG Semiconductor
Datasheet
1.EZ80F91.pdf
(387 pages)
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Table 25. Motorola Bus Mode Read States (Continued)
Table 26. Motorola Bus Mode Write States
PS027001-0707
STATE S6
STATE S7
STATE S0
STATE S1
STATE S2
STATE S3
STATE S4
STATE S5
STATE S6
STATE S7
During state S6, data from the external peripheral device is driven onto the data bus.
On the rising edge of the clock entering state S7, the CPU latches data from the addressed
peripheral device and deasserts AS and DS. The peripheral device deasserts DTACK at
this time.
The Write cycle starts in S0. The CPU drives R/W High (if a preceding Write cycle leaves R/
W Low).
Entering S1, the CPU drives a valid address on the address bus.
On the rising edge of S2, the CPU asserts AS and drives R/W Low.
During S3, the data bus is driven out of the high-impedance state as the data to be written is
placed on the bus.
At the rising edge of S4, the CPU asserts DS. The CPU waits for a cycle termination signal
DTACK (WAIT). If the termination signal is not asserted at least one full CPU clock period
prior to the rising clock edge at the end of S4, the CPU inserts WAIT (T
DTACK is asserted. Each wait state is a full bus mode cycle.
During S5, no bus signals are altered.
During S6, no bus signals are altered.
On entering S7, the CPU deasserts AS and DS. As the clock rises at the end of S7, the CPU
drives R/W High. The peripheral device deasserts DTACK at this time.
The eight states for a Write operation in Motorola bus mode are described in
Signal timing for Motorola bus mode is illustrated for a Read operation in
page 83 and for a Write operation in
Motorola bus mode state is 2 CPU system clock cycles in duration.
Figure 19
on page 84. In these two figures, each
Chip Selects and Wait States
Product Specification
WAIT
eZ80F91 ASSP
) states until
Figure 18
Table
26.
on
82
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