Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

MC68302FC20 Datasheet(PDF) 37 Page - Motorola, Inc

Part No. MC68302FC20
Description  Integrated Multiprotocol Processor User’s Manual
Download  480 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo 

MC68302FC20 Datasheet(HTML) 37 Page - Motorola, Inc

Zoom Inzoom in Zoom Outzoom out
 37 / 480 page
background image
MC68000/MC68008 Core
MOTOROLA
MC68302 USER’S MANUAL
2-7
Other bus masters besides the M68000 may also output function codes during their bus cy-
cles. On the MC68302, this capability is provided for each potential internal bus master (i.e.,
the IDMA, SDMA, and DRAM refresh units). Also on the MC68302, provision is made for the
decoding of function codes that are output from external bus masters (e.g., in the chip-select
generation logic).
In computer design, function code information can be used to protect certain portions of the
address map from unauthorized access or even to extend the addressable range beyond
the M68000 16-Mbyte address limit. However, in controller applications, function codes are
used most often as a debugging aid. Furthermore, in many controller applications, the
M68000 stays continuously in the supervisor state.
* This is the function code output for the M68000 interrupt
acknowledge cycle.
All exception processing occurs in the supervisor state, regardless of the state of the S bit
when the exception occurs. The bus cycles generated during exception processing are clas-
sified as supervisor references. All stacking operations during exception processing use the
SSP.
The user state is the lower state of privilege. For instruction execution, the user state is de-
termined by the S bit of the SR; if the S bit is negated (low), the processor is executing in-
structions in the user state. Most instructions execute identically in either user state or
supervisor state. However, instructions having important system effects are privileged. User
programs are not permitted to execute the STOP instruction or the RESET instruction. To
ensure that a user program cannot enter the supervisor state except in a controlled manner,
the instructions which modify the entire SR are privileged. To aid in debugging programs to
be used in operating systems, the move-to-user-stack-pointer (MOVE to USP) and move-
from-user-stack-pointer (MOVE from USP) instructions are also privileged.
The supervisor state is the highest state of privilege. For instruction execution, the supervi-
sor state is determined by the S bit of the SR; if the S bit is asserted (high), the processor is
in the supervisor state. The bus cycles generated by instructions executed in the supervisor
state are classified as supervisor references. While the processor is in the supervisor privi-
lege state, those instructions using either the system stack pointer implicitly or address reg-
ister seven explicitly access the SSP.
Table 2-4. M68000 Address Spaces
Function Code Output
FC2
FC1
FC0
Reference Class
1
0
0
(Unassigned)
0
0
1
User Data
0
1
0
User Program
0
1
1
(Unassigned)
1
0
0
(Unassigned)
1
0
1
Supervisor Data
1
1
0
Supervisor Program
1
1
1
CPU Space
*


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




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   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