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PDF UPD78P4908 Data sheet ( Hoja de datos )
| Número de pieza | UPD78P4908 | |
| Descripción | 16-BIT SINGLE-CHIP MICROCONTROLLER | |
| Fabricantes | NEC | |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD78P4908
16-BIT SINGLE-CHIP MICROCONTROLLER
DESCRIPTION
The µPD78P4908, 78K/IV series' product, is a one-time PROM version of the µPD784907 and µPD784908 with
internal mask ROM.
Since user programs can be written to PROM, this microcomputer is best suited for evaluation in system
development, manufacture of small quantities of multiple products, and fast start-up of applications.
For specific functions and other detailed information, consult the following user's manuals.
These manuals are required reading for design work.
µPD784908 Subseries User's Manual - Hardware : U11787E
78K/IV Series User's Manual - Instruction
: U10905E
FEATURES
• 78K/IV series
• Internal PROM: 128 Kbytes
• Internal RAM: 4,352 bytes
• Supply voltage: VDD = 4.5 to 5.5 V
(At main clock: fXX = 12.58 MHz, internal system clock = fXX: fCYK = 79 ns)
VDD = 4.0 to 5.5 V
(Other than above: fCYK = 159 ns)
ORDERING INFORMATION
Part number
µPD78P4908GF-3BA
Package
100-pin plastic QFP (14 × 20 mm)
Internal ROM
One-time PROM
The information in this document is subject to change without notice.
Document No. U11681EJ2V0DS00 (2nd edition)
Date Published February 1999 N CP(K)
Printed in Japan
The mark shows major revised points.
©
1996
1 page  
CONTENTS
µPD78P4908
1. DIFFERENCES BETWEEN µPD78P4908 AND MASK ROM PRODUCTS ............................ 6
2. PIN CONFIGURATION (TOP VIEW) ......................................................................................... 7
3. BLOCK DIAGRAM ..................................................................................................................... 10
4. PIN FUNCTIONS ........................................................................................................................ 11
4.1 PINS FOR NORMAL OPERATING MODE .................................................................................... 11
4.2 PINS FOR PROM PROGRAMMING MODE (VPP ≥ +5 V or +12.5 V, RESET = L) .................... 14
4.2.1 Pin Functions ................................................................................................................. 14
4.2.2 Pin Functions ................................................................................................................. 15
4.3 I/O CIRCUITS FOR PINS AND HANDLING OF UNUSED PINS ................................................. 16
5. INTERNAL MEMORY SIZE SELECT REGISTER (IMS) .......................................................... 19
6. PROM PROGRAMMING ............................................................................................................ 20
6.1 OPERATION MODE ........................................................................................................................ 20
6.2 PROM WRITE SEQUENCE ............................................................................................................ 22
6.3 PROM READ SEQUENCE ............................................................................................................. 26
7. SCREENING ONE-TIME PROM PRODUCTS .......................................................................... 26
8. ELECTRICAL CHARACTERISTICS ......................................................................................... 27
9. PACKAGE DRAWING ................................................................................................................ 51
10. RECOMMENDED SOLDERING CONDITIONS ........................................................................ 52
APPENDIX A DEVELOPMENT TOOLS.......................................................................................... 53
APPENDIX B CONVERSION SOCKET (EV-9200GF-100) PACKAGE DRAWING ..................... 56
APPENDIX C RELATED DOCUMENTS ......................................................................................... 58
Data Sheet U11681EJ2V0DS00
5
5 Page 
µPD78P4908
4. PIN FUNCTIONS
4.1 PINS FOR NORMAL OPERATING MODE
(1) Port pins (1/2)
Pin
P00-P07
P10
P11
P12
P13
P14
P15-P17
P20
P21
P22
P23
P24
P25
P26
P27
P30
P31
P32
P33
P34-P37
P40-P47
I/O
I/O
I/O
Input
I/O
I/O
Also used as
Function
— Port 0 (P0):
• 8-bit I/O port.
• Functions as a real-time output port (4 bits × 2).
• Inputs and outputs can be specified bit by bit.
• The use of built-in pull-up resistors can be simultaneously specified by
software for all pins in input mode.
• Can drive a transistor.
—
—
ASCK2/SCK2
RxD2/SI2
TxD2/SO2
Port 1 (P1):
• 8-bit I/O port.
• Inputs and outputs can be specified bit by bit.
• The use of built-in pull-up resistors can be simultaneously specified by
software for all pins in input mode.
• Can drive LED.
—
NMI
INTP0
INTP1
INTP2/CI
INTP3
INTP4/ASCK/SCK1
INTP5
Port 2 (P2):
• 8-bit input-only port.
• P20 does not function as a general-purpose port (nonmaskable
interrupt). However, the input level can be checked by an interrupt
service routine.
• The use of built-in pull-up resistors can be specified by software for pins
P22 to P27 (in units of 6 bits).
• The P25/INTP4/ASCK/SCK1 pin functions as the SCK1 input/output pin
by CSIM1.
SI0
RxD/SI1
TxD/SO1
SCK0
SO0
TO0-TO3
Port 3 (P3):
• 8-bit I/O port.
• Inputs and outputs can be specified bit by bit.
• The use of built-in pull-up resistors can be simultaneously specified by
software for all pins in input mode.
• P32 and P33 can be set as the N-ch open-drain pin.
AD0-AD7
Port 4 (P4):
• 8-bit I/O port.
• Inputs and outputs can be specified bit by bit.
• The use of built-in pull-up resistors can be simultaneously specified by
software for all pins in input mode.
• Can drive LED.
Data Sheet U11681EJ2V0DS00
11
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