H8SLASH3003 datasheet(141/715 Pages) RENESAS

141 / 715 page

Pin Wait Mode 1: In all accesses to external three-state-access areas, the number of wait states

(TW) selected by bits WC1 and WC0 are inserted. If the WAIT pin is low at the fall of the system

clock (ø) in the last of these wait states, an additional wait state is inserted. If the

WAIT pin

remains low, wait states continue to be inserted until the

WAIT signal goes high.

Pin wait mode 1 is useful for inserting four or more wait states, or for inserting different numbers

of wait states for different external devices.

If the wait count is 0, this mode operates in the same way as pin wait mode 0.

Figure 6-13 shows the timing when the wait count is 1 (WC1 = 0, WC0 = 1) and one additional

wait state is inserted by

WAIT input.

Figure 6-13 Pin Wait Mode 1

Address bus

Data bus

HWR, LWR

Write data

Read data

Read

access

Write

access

Note:

Arrows indicate time of sampling of the

pin.

WAIT

Data bus

External address

Write data

Inserted by

wait count

Inserted by

signal

WAIT

123

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