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7643 Datasheet(PDF) 298 Page - Renesas Technology Corp

Part # 7643
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  424 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7643 Datasheet(HTML) 298 Page - Renesas Technology Corp

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Rev.2.00
Aug 28, 2006
page 177 of 202
7643 Group
REJ09B0133-0200
APPLICATION
2.8 External device connection
2.8.4 Slow memory wait
The slow memory wait function is for easier interfacing with external devices that have long access
times. This can be enabled in the memory expansion mode and microprocessor mode.
The wait is effective only to external areas. Access to internal area is always performed without wait.
(1) Software wait
The software wait is selected by setting “00” to the slow memory wait mode select bits (b3, b2
of CPMB).
Figure 2.8.4 shows the software wait timing example.
φOUT
ADOUT
DB IN/OUT
RD
WR
1 bus cycle
IN
OUT
IN
OUT
<< No Wait >>
<< Wait >>
1 bus cycle
φOUT
ADOUT
DB IN/OUT
RD
WR
Address
Address
Address
Address
Note: Accessing to internal areas is always performed on this waveform.
Note: This example is the 1-cycle software wait.
Refer to Chapter 1 “Slow Memory Wait in PROCESSOR MODE” for 2- and
3-cycle software wait timings.
Fig. 2.8.4 Software wait timing example



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