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7733 Datasheet(PDF) 338 Page - Renesas Technology Corp

Part # 7733
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7733 Datasheet(HTML) 338 Page - Renesas Technology Corp

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CONNECTING EXTERNAL DEVICES
7733 Group User’s Manual
12–13
12.2 Software wait
12.2 Software wait
The software wait facilitates access to external devices which require a long access time. There are two
types of software waits: wait 0 and wait 1.
The software wait is set by the wait bit (bit 2 at address 5E16) and the wait selection bit (bit 0 at address
5F16). (Refer to Table 12.2.1.) Figure 12.2.1 shows the structures of the processor mode register 0 (address
5E16) and processor mode register 1 (address 5F16). Figure 12.2.2 shows bus timing examples when the
software wait is used.
The software wait is valid only for the external area. (Access to the internal areas is always performed with
no wait.)
Table 12.2.1 Setting method of software wait
Wait bit
Wait selection bit
Software wait
Bus cycle
1
0
0
Invalid (No wait)
Wait 0
Wait 1
Cycle of “internal clock
φ divided by 2”
(clock
φ1’s cycle ! 2)
“Cycle in the no-wait state” ! 2
(clock
φ1’s cycle ! 4)
“Cycle in the no-wait state” ! 1.5
(clock
φ1’s cycle ! 3)
0
0
1



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