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PDF UPD78F4938A Data sheet ( Hoja de datos )
| Número de pieza | UPD78F4938A | |
| Descripción | 16-Bit Single-Chip Microcontroller | |
| Fabricantes | NEC Electronics | |
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DATA SHEET
MOS INTEGRATED CIRCUITS
µPD78F4938A
16-BIT SINGLE-CHIP MICROCONTROLLER
DESCRIPTION
The µPD78F4938A is a product in the µPD784938A Subseries in the 78K/IV Series.
The µPD78F4938A has flash memory in place of the internal ROM of the µPD784938A. The flash memory
incorporated enables program writing or erasing with the microcontroller mounted on the target board.
Detailed function descriptions are provided in the following user’s manuals. Be sure to read them before
designing.
µPD784938A Subseries User’s Manual Hardware: U13570E
78K/IV Series User’s Manual Instructions:
U10905E
FEATURES
• Pin-compatible with mask ROM version (except VPP pin)
• Flash memory: 256 KB
• Internal RAM: 10496 bytes
• Serial interface:
4 channels
• UART/IOE (3-wire serial I/O): 2 channels (on-chip baud rate generator)
• CSI (3-wire serial I/O):
2 channels
• On-chip IEBusTM controller
• Supply voltage: VDD = 4.0 to 5.5 V (@12.58 MHz operation)
VDD = 3.0 to 5.5 V (@6.29 MHz operation)
APPLICATION
Car audio, etc.
ORDERING INFORMATION
Part Number
µPD78F4938AGF-3BA
Package
100-pin plastic QFP (14 × 20)
Internal ROM
256 KB
Internal RAM
10496 bytes
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. U14118EJ1V0DS00
Date Published March 2001 N CP(K)
Printed in Japan
©
12900919, 2001
1 page  
µPD78F4938A
CONTENTS
1. DIFFERENCES AMONG PRODUCTS IN µPD784938A SUBSERIES ................................... 6
2. PIN CONFIGURATION (TOP VIEW) ........................................................................................... 7
3. BLOCK DIAGRAM ......................................................................................................................... 9
4. PIN FUNCTIONS ............................................................................................................................ 10
4.1 Port Pins ................................................................................................................................. 10
4.2 Non-Port Pins ........................................................................................................................ 12
4.3 Pin I/O Circuits and Recommended Connection of Unused Pins ................................. 14
5. INTERNAL MEMORY SIZE SWITCHING REGISTER (IMS) .................................................. 18
6. PROGRAMMING FLASH MEMORY ............................................................................................ 19
6.1 Selecting Communication Mode ......................................................................................... 19
6.2 Flash Memory Programming Functions ............................................................................ 20
6.3 Connecting Flashpro III ........................................................................................................ 21
7. ELECTRICAL SPECIFICATIONS .................................................................................................. 22
8. PACKAGE DRAWING .................................................................................................................... 42
9. RECOMMENDED SOLDERING CONDITIONS ........................................................................... 43
APPENDIX A. DEVELOPMENT TOOLS ............................................................................................ 44
APPENDIX B. RELATED DOCUMENTS ........................................................................................... 47
Data Sheet U14118EJ1V0DS
5
5 Page 
µPD78F4938A
4.1 Port Pins (2/2)
Pin Name
P70 to P77
P90 to P97
I/O Alternate Function
Function
I/O ANI0 to ANI7
Port 7 (P7):
• 8-bit I/O port.
• Input/output can be specified in 1-bit units.
I/O — Port 9 (P9):
• 8-bit I/O port.
• Input/output can be specified in 1-bit units.
• An on-chip pull-up resistor can be specified by means of software for pins in
input mode.
P100 to P104
P105
P106
P107
I/O
—
SCK3
SI3
SO3
Port 10 (P10):
• 8-bit I/O port.
• Input/output can be specified in 1-bit units.
• An on-chip pull-up resistor can be specified by means of software for pins in
input mode.
• P105 and P107 can be specified for N-ch open-drain connection.
Data Sheet U14118EJ1V0DS
11
11 Page | ||
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