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EM78P451 Datasheet(PDF) 3 Page - ELAN Microelectronics Corp

Part # EM78P451
Description  8-Bit Microcontroller with OTP ROM
Download  54 Pages
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P451 Datasheet(HTML) 3 Page - ELAN Microelectronics Corp

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Contents
Product Specification (V1.1) 06.30.2003
• iii
Contents
1
GENERAL DESCRIPTION ................................................................................................... 1
2
FEATURES ........................................................................................................................... 1
3
PIN ASSIGNMENT ............................................................................................................... 2
4
FUNCTION DESCRIPTION.................................................................................................. 4
4.1 Operational Registers ..................................................................................................4
4.1.1
R0 (Indirect Address Register) ......................................................................................4
4.1.2
R1 (TCC) .......................................................................................................................4
4.1.3
R2 (Program Counter) & Stack......................................................................................4
4.1.4
R3 (Status Register) ......................................................................................................6
4.1.5
R4 (RAM Select Register) .............................................................................................6
4.1.6
R5~R8 (Port 5 ~ Port8)..................................................................................................6
4.1.7
R9 (Port9) ......................................................................................................................7
4.1.8
RA (SPIRB: SPI Read Buffer)........................................................................................8
4.1.9
RB (SPIWB: SPI Write Buffer).......................................................................................8
4.1.10 RC (SPIS: SPI Status Segister).....................................................................................8
4.1.11 RD (SPIC: SPI Control Register)...................................................................................9
4.1.12 RE (TMR1: Timer1 register) ..........................................................................................9
4.1.13 RF (PWP: Pulse width preset register)........................................................................10
4.1.14 R20~R3E (General Purpose Register)........................................................................10
4.1.15 R3F (Interrupt Status Register) ...................................................................................10
4.2 Special Purpose Registers .........................................................................................10
4.2.1
A (Accumulator) ...........................................................................................................10
4.2.2
CONT (Control Register) .............................................................................................10
4.2.3
IOC5 ~ IOC9 (I/O Port Control Register)..................................................................... 11
4.2.4
IOCC (T1CON: Timer1 Control Register).................................................................... 11
4.2.5
IOCD (Pull-high Control Register) ...............................................................................12
4.2.6
IOCE (WDT Control Register) .....................................................................................12
4.2.7
IOCF (Interrupt Mask Register) ...................................................................................13
4.3 TCC/WDT Presacler ..................................................................................................14
4.4 I/O Ports .....................................................................................................................15
4.5 SERIAL PERIPHERAL INTERFACE MODE..............................................................17
4.5.1
Overview & Features ...................................................................................................17
4.5.2
SPI Function Description.............................................................................................19
4.5.3
SPI Signal & Pin Description .......................................................................................20
4.5.4
Programmed the Related Registers ............................................................................22
4.5.5
SPI Mode Timing .........................................................................................................24
4.5.6
Software Application of SPI .........................................................................................25
4.6 Timer 1 .......................................................................................................................29
4.6.1
Overview......................................................................................................................29
4.6.2
Function Description....................................................................................................30


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