Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ST6215C Datasheet(PDF) 13 Page - STMicroelectronics

Part No. ST6215C
Description  8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
Download  105 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo 

ST6215C Datasheet(HTML) 13 Page - STMicroelectronics

Zoom Inzoom in Zoom Outzoom out
 13 / 105 page
background image
ST6215C/ST6225C
13/105
MEMORY MAP (Cont’d)
3.1.6 Data ROM Window Mechanism
The Data read-only memory window is located
from address 0040h to address 007Fh in Data
space. It allows direct reading of 64 consecutive
bytes located anywhere in program memory, be-
tween address 0000h and 0FFFh.
There are 64 blocks of 64 bytes in a 4K device:
– Block 0 is related to the address range 0000h to
003Fh.
– Block 1 is related to the address range 0040h to
007Fh.
and so on...
All the program memory can therefore be used to
store either instructions or read-only data. The
Data ROM window can be moved in steps of 64
bytes along the program memory by writing the
appropriate code in the Data ROM Window Regis-
ter (DRWR).
Figure 5. Data ROM Window
3.1.6.1 Data ROM Window Register (DRWR)
The DRWR can be addressed like any RAM loca-
tion in the Data Space.
This register is used to select the 64-byte block of
program memory to be read in the Data ROM win-
dow (from address 40h to address 7Fh in Data
space). The DRWR register is not cleared on re-
set, therefore it must be written to before access-
ing the Data read-only memory window area for
the first time.
Address: 0C9h
Write Only
Reset Value = xxh (undefined)
Bits 7:6 = Reserved, must be cleared.
Bits 5:0 = DRWR[5:0]
Data read-only memory
Window Register Bits. These are the Data read-
only memory Window bits that correspond to the
upper bits of the data read-only memory space.
Caution: This register is undefined on reset, it is
write-only, therefore do not read it nor access it us-
ing Read-Modify-Write instructions (SET, RES,
INC and DEC).
0000h
0FFFh
000h
040h
07Fh
0FFh
DATA ROM
WINDOW
DATA SPACE
64-BYTE
ROM
PROGRAM
SPACE
70
-
-
DRWR5 DRWR4 DRWR3 DRWR2 DRWR1 DRWR0
1


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