P90CE201 datasheet(8/77 Pages) PHILIPS

8 / 77 page

August 1993

Philips Semiconductors

Product speciﬁcation

16-bit microcontroller

P90CE201

CPU FUNCTIONAL DESCRIPTION

5.1

General

The CPU of the P90CE201 is software compatible with the

68000, consequently programs written for the 68000 will

run on the P90CE201 unchanged. However, for certain

applications the following differences between the

processors should be noted:

• The initialization of the System Control Registers.

• Differences exist in the address error exception

processing since the P90CE201 can provide full error

recovery.

• The timing is different because of the P90CE201’s new

architecture and technology. The instruction execution

timing is completely different for the same reason.

5.2

5.2 Programming model and data organization

The programming model is identical to that of the 68000

and is shown in Fig.3. It contains seventeen 32-bit

registers, a 32-bit Program Counter and a 16-bit Status

data registers for byte, word and long-word operations.

The second group of registers (A0 to A6) and the System

Stack Pointer (A7) can be used as software stack pointers

and base address registers. In addition, these registers

can be used for word and long-word address operations.

All seventeen registers can be used as Index Registers.

The P90CE201 supports 8, 16 and 32-bit integer data,

BCD data 32-bit addresses. Each data type is arranged in

memory as shown in Fig.4.

Fig.3 Programming model.

handbook, full pagewidth

Eight

Data

Registers

Program

Counter

Two Stack

Pointers

Seven

Address

Registers

16 15

USER STACK POINTER

SUPERVISOR STACK POINTER

16 15

Status

SYSTEM

BYTE

USER

BYTE

MCD504

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