Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

UPD784938 Datasheet(PDF) 81 Page - NEC

Part # UPD784938
Description  16-Bit Single-Chip Microcontrollers
Download  733 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD784938 Datasheet(HTML) 81 Page - NEC

Back Button UPD784938 Datasheet HTML 77Page - NEC UPD784938 Datasheet HTML 78Page - NEC UPD784938 Datasheet HTML 79Page - NEC UPD784938 Datasheet HTML 80Page - NEC UPD784938 Datasheet HTML 81Page - NEC UPD784938 Datasheet HTML 82Page - NEC UPD784938 Datasheet HTML 83Page - NEC UPD784938 Datasheet HTML 84Page - NEC UPD784938 Datasheet HTML 85Page - NEC Next Button
Zoom Inzoom in Zoom Outzoom out
 81 / 733 page
background image
81
CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U13987EJ1V0UM00
3.4.2 Special function register (SFR) area
The on-chip peripheral hardware special function registers (SFRs) are mapped onto the area from 0FF00H to 0FFFFH (see
Figures 3-1, 3-2, 3-3, and 3-4).
The area from 0FFD0H to 0FFDFH is mapped as an external SFR area, and allows externally connected peripheral I/Os,
etc., to be accessed in external memory expansion mode (specified by the memory expansion mode register (MM)) by the ROM-
less product or on-chip ROM products.
Caution
Addresses onto which SFRs are not mapped should not be accessed in this area. If such an address is
accessed by mistake, the CPU may become deadlocked. A deadlock can only be released by reset input.
Remark
The addresses in this text are those that apply when the LOCATION 0 instruction is executed. When the
LOCATION 0FH instruction is executed, 0F0000H should be added to the values shown in the text.
3.4.3 External SFR area
In
µPD784938 Subseries products, the 16-byte area from 0FFD0H to 0FFDFH in the SFR area (when the LOCATION 0 is
executed; 0FFFD0H to 0FFFDFH when the LOCATION 0FH instruction is executed) is mapped as an external SFR area. When
the external memory expansion mode is set in a ROM-less product or on-chip ROM product, externally connected peripheral
I/Os, etc., can be accessed using the address bus or address/data bus, etc.
As the external SFR area can be accessed by SFR addressing, peripheral I/O and similar operations can be performed easily,
the object size can be reduced, and macro service can be used.
Bus operations for accesses to the external SFR area are performed in the same way as for ordinary memory accesses.
3.5 External Memory Space
The external memory space is a memory space that can be accessed in accordance with the setting of the memory expansion
mode register (MM). It can store programs, table data, etc., and can have peripheral I/O devices allocated to it.


Similar Part No. - UPD784938

ManufacturerPart #DatasheetDescription
logo
NEC
UPD784938A NEC-UPD784938A Datasheet
371Kb / 52P
   16-BIT SINGLE-CHIP MICROCONTROLLER
logo
Renesas Technology Corp
UPD784938AGF-XXX-3BA RENESAS-UPD784938AGF-XXX-3BA Datasheet
692Kb / 104P
   MOS INTEGRATED CIRCUITS
2001
More results

Similar Description - UPD784938

ManufacturerPart #DatasheetDescription
logo
Renesas Technology Corp
UPD78F1502AGK-GAK-AX RENESAS-UPD78F1502AGK-GAK-AX Datasheet
6Mb / 1031P
   16-Bit Single-Chip Microcontrollers
logo
NEC
UPD784214A NEC-UPD784214A Datasheet
561Kb / 50P
   16-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784915A NEC-UPD784915A Datasheet
446Kb / 86P
   16-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784915B NEC-UPD784915B Datasheet
384Kb / 86P
   16-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784224 NEC-UPD784224 Datasheet
687Kb / 92P
   16/8-BIT SINGLE-CHIP MICROCONTROLLERS
logo
Siemens Semiconductor G...
C167CR-16RM SIEMENS-C167CR-16RM Datasheet
1Mb / 67P
   16-Bit CMOS Single-Chip Microcontrollers
logo
NEC
UPD78363A NEC-UPD78363A Datasheet
502Kb / 96P
   16/8-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784035Y NEC-UPD784035Y Datasheet
503Kb / 94P
   16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784218 NEC-UPD784218 Datasheet
617Kb / 92P
   16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
logo
Siemens Semiconductor G...
C161V SIEMENS-C161V_96 Datasheet
3Mb / 260P
   16-Bit CMOS Single-Chip Microcontrollers
More results


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




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

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