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PDF uPD789841 Data sheet ( Hoja de datos )

Número de pieza uPD789841
Descripción 8-BIT Single-chip MICROCONTROLLERS
Fabricantes NEC Electronics 
Logotipo NEC Electronics Logotipo



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No Preview Available ! uPD789841 Hoja de datos, Descripción, Manual

PRELIMINARY PRODUCT INFORMATIONwww.DataSheet4U.com
MOS INTEGRATED CIRCUIT
µPD789841, 789842
8-BIT SINGLE-CHIP MICROCONTROLLERS
The µPD789841 and µPD789842 are µPD789842 subseries products of the 78K/0S series.
These microcontrollers incorporate an inverter control timer being suitable for controlling general-purpose
inverters.
The µPD78F9842, a product with on-chip flash memory which can operate on the same supply voltage as for
masked ROM products and various development tools are also under development.
Detailed descriptions of their functions, etc., are given in the following user's manuals. Be sure to
read them for design purposes.
µPD789842 Subseries User's Manual : To be prepared
78K/0S Series User's Manual, Instruction : U11047E
FEATURES
On-chip ROM and RAM
Product name
µPD789841
µPD789842
Item
Program memory
(ROM)
8K bytes
16K bytes
Data memory
(Internal high-speed RAM)
Package
256 bytes
44-pin plastic QFP (10 × 10 mm)
Minimum instruction execution time can be switched between high speed (0.24 µs) and low speed (0.96 µs)
(when the system clock operates at 8.38 MHz).
I/O port: 30
Timer: 6 channels
10-bit inverter control timer : 1 channel
8-bit timer/event counter : 2 channels
8-bit timer counter
: 1 channel
Watch timer
: 1 channel
Watchdog timer
: 1 channel
8-bit resolution A/D converter: 8 channels
Serial interface (UART00): 1 channel
Multiplier: 10 bits × 10 bits = 20 bits
SWAP: The contents of the high-order four bits of an 8-bit register can be exchanged with the low-order four
bits.
Vectored interrupt source: 14
Supply voltage: VDD = 4.0 to 5.5 V
APPLICATIONS
Inverter-driven air conditioners, etc.
The information contained in this document is being issued in advance of the production cycle for the
device. The parameters for the device may change before final production or NEC Corporation, at its own
discretion, may withdraw the device prior to its production.
Document No. U13790EJ1V0PM00 (1st edition)
Date Published November 1998 J CP(K)
Printed in Japan
©
1998

1 page




uPD789841 pdf
µPD789ww8w4.D1ata,Sh7eet84U9.co8m42
FUNCTIONS
Item
Internal memory
ROM
High-speed RAM
Minimum instruction execution time
General-purpose register
Instruction set
I/O ports
Timer
A/D converters
Serial interface
Multiplier
SWAP
Vector interrupt
source
Maskable
Nonmaskable
Power supply voltage
Operating ambient temperature
Package
µPD789841
µPD789842
8K bytes
16K bytes
256 bytes
0.24 µs/0.96 µs (when the system clock operates at 8.38 MHz)
8 bits × 8 registers
16-bit operation
Bit manipulation (set, reset, and test) etc.
Total of 30 port pins
22 CMOS input/output pins
8 CMOS input pins
10-bit inverter control timer : 1 channel
8-bit timer/event counter : 2 channels
8-bit timer counter
: 1 channel
Watch timer
: 1 channel
Watchdog timer
: 1 channel
Eight channels with 8-bit resolution
UART: 1 channel
10 bits × 10 bits = 20 bits
The contents of the high-order four bits of an 8-bit register can be exchanged with
the low-order four bits.
Internal: 11, external: 2
Internal: 1
VDD = 4.0 to 5.5 V
TA = -40°C to +85°C
44-pin plastic QFP (10 × 10 mm)
Preliminary Product Information
5

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uPD789841 arduino
µPD789ww8w4.D1ata,Sh7eet84U9.co8m42
3.3 Pin Input/Output Circuits and Handling of Unused Pins
Table 3-1 lists the types of input/output circuits for each pin and explains how unused pins are handled.
Figure 3-1 shows the configuration of each type of input/output circuit.
Table 3-1. Type of Input/Output Circuit for Each Pin
Pin name
P00-P07
P10-P17
P20/TOFF7
P21/TxD
P22/RxD
P23/TO82
P24/INTP0/TI80
P25/INTP1/TI81
P60/ANI0-P67/ANI7
TO70-TO75
RESET
IC
I/O circuit type
5-A
I/O
I/O
8-A
Recommended connection of unused pins
Input : Connect these pins separately to VDD or VSS via respective
resistors.
Output : Leave these pins open.
9-C Input Connect this pin directly to VDD or VSS.
4 Output Connect this pin to VDD or VSS via respective resistors.
2 Input
-
- - Connect this pin directly to VSS.
Preliminary Product Information
11

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