EM78P159NP datasheet(10/48 Pages) EMC

Part #	EM78P159NP

Description	8-Bit Microcontroller with OTP ROM

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Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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EM78P159N

8-Bit Microcontrollerwith OTP ROM

6

•

Product Specification (V1.0) 03.10.2006

(This specification is subject to change without further notice)

4

Function Description

Interrupt

Controller

ROM

Instruction

Register

Instruction

Decoder

R2

ALU

Stack

ACC

R3

R4

Oscillator/Timing

Control

WDT timer

Prescaler

R1(TCC)

RAM

DATA & CONTROL BUS

OSCI

OSCO

/RESET

TCC

/INT

I/O

PORT 6

IOC6

R6

P60//INT

P61

P62

P63

P64

P65

P66

P67

I/O

PORT 5

IOC5

R5

P52

P53

P54

P55

IOCA

P50

P51

P56

Figure 4-1 Function Block Diagram

4.1

Operational Registers

4.1.1 R0 (Indirect Addressing Register)

R0 is not a physically implemented register. Its major function is to perform as an

indirect addressing pointer. Any instruction using R0 as a pointer actually accesses

data pointed by the RAM Select Register (R4).

4.1.2 R1 (Time Clock /Counter)

Increased by an external signal edge, which is defined by TE bit (CONT-4)

through the TCC pin, or by the instruction cycle clock.

Writable and readable as any other registers.

Defined by resetting PAB(CONT-3).

The prescaler is assigned to TCC, if the PAB bit (CONT-3) is reset.

The contents of the prescaler counter will be cleared only when TCC register is

written with a value.

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EM78P159NP Datasheet(PDF) 10 Page - ELAN Microelectronics Corp

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