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PDF EM78P451S Data sheet ( Hoja de datos )
| Número de pieza | EM78P451S | |
| Descripción | 8-Bit Microcontroller with OTP ROM | |
| Fabricantes | ELAN Microelectronics | |
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EM78P451S
8-Bit Microcontroller
with OTP ROM
Product
Specification
DOC. VERSION 1.0
ELAN MICROELECTRONICS CORP.
June 2004
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1 page  
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EM78P451S
8-Bit Microcontroller with OTP ROM
1 GENERAL DESCRIPTION
The EM78P451S is an 8-bit microprocessor designed and developed with low-power,
high speed CMOS technology. Its operational kernel is implemented with RISC-like
architecture and is available in the mask ROM version. The one time programmable
(OTP) version is flexible, both in mass production or engineering test stages. OTP
provide users with unlimited volume with favorable price opportunities. This device is
equipped with the Serial Peripheral Interface (SPI) function. The EM78P451S is very
suitable for wired communication. Only 58 easy-to-learn instructions are needed and
user’s program can be emulated with EMC In-Circuit Emulator (ICE).
2 FEATURES
Operating voltage range: 2.3V~5.5V.
Operating temperature range: 0°C~70°C.
Operating frequency range (base on 2 clocks ):
• Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.3V.
• RC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.3V.
Low power consumption:
• Less then 3 mA at 5V/4MHz
• Typically 10 µA during sleep mode
Serial Peripheral Interface (SPI) available.
4K × 13 bits on chip ROM (EM78P451S).
11 special function registers.
140× 8 bits on chip general-purposed registers.
5 bi-directional I/O ports (35 I/O pins).
3 LED direct sinking pins with internal serial resistors.
Built-in RC oscillator with external serial resistor, ±10% variation.
Built-in power-on reset.
5 stacks for subroutine nesting.
8-bit real time clock/counter (TCC) with overflow interrupt.
Two machine clocks or four machine clocks per instruction cycle.
Power down mode.
Programmable wake up from sleep circuit on I/O ports.
www.DataSheet4UP.rcoogrmammable free running on-chip watchdog timer.
Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
•1
5 Page 
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EM78P451S
8-Bit Microcontroller with OTP ROM
4.1.6 R5~R8 (Port 5 ~ Port8)
Four general 8 bits I/O registers
Both P74 and P76 read or write data from the DATA pin, while both P75 and P77
read or write data from the CLK pin.
4.1.7 R9 (Port9)
A general 6-bit I/O register. The values of the two most significant bits are read as
"0".
Aaddress
R PAGE registers
IOC PAGE registers
00 R0 (Indirect Addressing Register)
Reserve
01 R1 (Time Clock Counter)
CONT (Control Register)
02 R2 (Program Counter)
Reserve
03 R3 (Status Register)
Reserve
04 R4 (RAM Select Register)
Reserve
05 R5 (Port5)
IOC5 (I/O Port Control Register)
06 R6 (Port6)
IOC6 (I/O Port Control Register)
07 R7 (Port7)
IOC7 (I/O Port Control Register)
08 R8 (Port8)
IOC8 (I/O Port Control Register)
09 R9 (Port9)
IOC9 (I/O Port Control Register)
0A RA (SPI read buffer)
0B RB (SPI write buffer)
0C RC (SPI status buffer)
Reserve
Reserve
IOCC (Timer1 Control Register)
0D RD (SPI control buffer)
IOCD (Pull_high Control Register)
0E RE (Timer1 register)
IOCE (WDT Control Register)
0F
RF (Pulse width preset register)
IOCF (Interrupt Mask Register)
10
General Registers
1F
20
Bank0 Bank1 Bank2 Bank3
3E
3F R3F (Interrupt Status Register)
Fig. 4 Data memory configuration
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Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
•7
11 Page | ||
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| PDF Descargar | [ Datasheet EM78P451S.PDF ] | |
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