EM78P447SAM datasheet(8/55 Pages) EMC

8 / 55 page

EM78P447S

OTP ROM

4. FUNCTION DESCRIPTION

IO C 5

IO C 6

IO C 7

ACC

STAC K 1

STAC K 2

STAC K 3

STAC K 4

STAC K 5

P C

RO M

In stru ctio n

Re giste r

In stru ctio n

D ecoder

ALU

Inte rru p t

C ontro l

RA M

WD T T im e r

P re sca le

O scillato r/T im in g

C ontro l

WD T

Tim e

- out

R1(T C C )

S leep

Wa ke

C ontro l

DA T A & CO NT RO L B U S

/IN T

TC C

OS C I

OS C O

/R E SET

Fig. 2 Functional Block Diagram

4.1 Operational Registers

1. R0 (Indirect Addressing Register)

R0 is not a physically implemented register. Its major function is to act as an indirect addressing

pointer. Any instruction using R0 as a pointer actually accesses data pointed by the RAM Select

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 a value.

This specification is subject to change without prior notice.

06.25.2003 (V1.1)

EM78P447SAM Datasheet(PDF) 8 Page - ELAN Microelectronics Corp

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