Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

7641 Datasheet(PDF) 254 Page - Renesas Technology Corp

Part # 7641
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  385 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7641 Datasheet(HTML) 254 Page - Renesas Technology Corp

Back Button 7641 Datasheet HTML 250Page - Renesas Technology Corp 7641 Datasheet HTML 251Page - Renesas Technology Corp 7641 Datasheet HTML 252Page - Renesas Technology Corp 7641 Datasheet HTML 253Page - Renesas Technology Corp 7641 Datasheet HTML 254Page - Renesas Technology Corp 7641 Datasheet HTML 255Page - Renesas Technology Corp 7641 Datasheet HTML 256Page - Renesas Technology Corp 7641 Datasheet HTML 257Page - Renesas Technology Corp 7641 Datasheet HTML 258Page - Renesas Technology Corp Next Button
Zoom Inzoom in Zoom Outzoom out
 254 / 385 page
background image
Rev.2.00
Aug 28, 2006
page 123 of 148
7641 Group
REJ09B0336-0200
APPLICATION
2.10 External devices connection
2.10.4 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 2.10.4 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. 2.10.4 Software wait timing example



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com