EM78P156EL データシートの表示（PDF） - Elan Microelectronics Corp

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EM78P156EL

8-BIT MICRO-CONTROLLER

Elan Microelectronics Corp 

EM78P156EL

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

IOC6

R6

I/O

PORT 6

P62

P63

IOC5 I/O

P64

PORT 5

P65

R5

P50

P51

P52

P53

P66

P67

Fig. 2 Function Block Diagram

4.1 Operational Registers

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).

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.

This specification is subject to change without prior notice.

8

07.29.2004 (V1.3)

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