Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

Z80 Datasheet(PDF) 219 Page - Zilog, Inc.

Part # Z80
Description  Z80 CPU PERIPHERALS
PDF  330 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 Datasheet(HTML) 219 Page - Zilog, Inc.

Back Button Z80 Datasheet HTML 215Page - Zilog, Inc. Z80 Datasheet HTML 216Page - Zilog, Inc. Z80 Datasheet HTML 217Page - Zilog, Inc. Z80 Datasheet HTML 218Page - Zilog, Inc. Z80 Datasheet HTML 219Page - Zilog, Inc. Z80 Datasheet HTML 220Page - Zilog, Inc. Z80 Datasheet HTML 221Page - Zilog, Inc. Z80 Datasheet HTML 222Page - Zilog, Inc. Z80 Datasheet HTML 223Page - Zilog, Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 219 / 330 page
background image
< %27 2GTKRJGTCNU
7UGT /CPWCN
UM008101-0601
Parallel Input/Output

Figure 13.
Daisy-Chain Interrupt Servicing
APPLICATIONS
Extending The Interrupt Daisy-chain
Without external logic, a maximum of four Z80 PIO devices may be daisy-
chained into a priority interrupt structure. This limitation allows the inter-
rupt enable status (IEO) to ripple through the entire daisy-chain between
the beginning of M1 and the beginning of IORQ during an interrupt
acknowledge cycle. The interrupt enable status cannot change during M1,
therefore, the vector address returned to the CPU is assured to be from the
highest priority device that requested an interrupt.
IEI
IEO
HI
+
IEI
IEO
HI
+
IEI
IEO
HI
+
IEI
IEO
HI
+
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
HI
+
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
LO
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
HI
IEI
IEO
LO
IEI
IEO
LO
IEI
IEO
LO
IEI
IEO
HI
HI
LO
LO
LO
HI
Port 2B
Port 1B
Port 2A
Under Service
Service Suspended
Service Resumed
Service Complete
5. Second ‘RETI’ instruction issued on completion of Port 2A service routine.
4. Port 1B service routine complete, ‘RETI’ issued, Port 2A service resumed.
3. Port 1B1 interrupts, suspends servicing of Port 2A.
2. Port 2A requests an interrupt and is Acknowledged.
1. Priority interrupt daisy chain before any interrupt occurs.
Service Complete
Under Service
Port 1A
Highest Priority Channel



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