P90CE201 데이터 시트보기 (PDF) - Philips Electronics

부품명

상세내역

제조사

P90CE201

16-bit microcontroller

Philips Electronics 

Philips Semiconductors

16-bit microcontroller

5.5.2 THE SPECIAL STATUS WORD (SSW)

Product specification

P90CE201

handbook, full pagewidth

bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RR * IF DF RM HB BY RW HW LC * * * FC FC FC

210

MCD513

Fig.8 Special Status Word.

Table 4 Description of SSW.

SYMBOL

RR

−

IF

DF

RM

HB

BY

RW

HW

LC

−

−

−

FC2

FC1

FC0

BIT

SSW.15

SSW.14

SSW.13

SSW.12

SSW.11

SSW.10

SSW.9

SSW.8

SSW.7

SSW.6

SSW.5

SSW.4

SSW.3

SSW.2

SSW.1

SSW.0

FUNCTION

Rerun. By default this bit is a logic 0. If set to a logic 1, the CPU will not re-run the

faulty bus cycle on return from exception (RTE).

Undefined, reserved

The faulty cycle was an instruction fetch.

The faulty cycle was a data fetch.

The error occurred during a read-modify-write cycle.

High Byte

The faulty cycle was a byte transfer.

Read/Write cycle

High Word

The faulty cycle was during a long-word access.

Undefined, reserved

Undefined, reserved

Undefined, reserved

Function Code. These three bits hold the internal function code during the faulty

bus cycle. The function codes are the same as for the 68000 and affect the status

of the CPU during the faulty bus cycle. See Table 5.

Table 5 Internal function codes.

FC2

FC1

FC0

ADDRESS SPACE

0

0

0

Reserved

0

0

1

User data

0

1

0

User program

0

1

1

Reserved

1

0

0

Reserved

1

0

1

Supervisor data

1

1

0

Supervisor program

1

1

1

Interrupt acknowledge

August 1993

15

Share Link: