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EM78P159NAS

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P159N

8-Bit Microcontrollerwith OTP ROM

4 Function Description

OSCO

OSCI /RESET

Oscillator/Timing

Control

WDT timer TCC /INT

Prescaler

IOCA

RAM

Interrupt

Controller

R4

R1(TCC)

ROM

Instruction

Register

Instruction

Decoder

R2

Stack

ALU

R3

ACC

DATA & CONTROL BUS

P60//INT

P61

P50

P51

IOC6

R6

I/O

PORT 6

P62

P63

IOC5 I/O

P64

PORT 5

P65

R5

P52

P53

P54

P55

P66

P56

P67

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.

6•

Product Specification (V1.0) 03.10.2006

(This specification is subject to change without further notice)

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