P89C669FA 查看數據表（PDF） - Philips Electronics

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P89C669FA

80C51 8-bit microcontroller family with extended memory; 96 kB Flash with 2 kB RAM

Philips Electronics 

Philips Semiconductors

P89C669

80C51 8-bit microcontroller family with extended memory

7.2 Memory arrangement

P89C669 has 96 kbytes of Flash (MX universal map range: 80:0000-81:7FFF) and

2 kbytes of on-chip RAM:

Table 4: Memory arrangement

Data memory

Size (Bytes) and MX

universal memory

map range

Type Description

P89C669

DATA

memory that can be addressed both directly and

indirectly; can be used as stack

128

(7F:0000-7F:007F)

IDATA

superset of DATA; memory that can be addressed

256

indirectly (where direct address for upper half is for SFR (7F:0000-7F:00FF)

only); can be used as stack

EDATA

superset of DATA/IDATA; memory that can be addressed 1280

indirectly using Universal Pointers (PR0,1); can be used (7F:0000-7F:04FF)

as stack

XDATA memory (on-chip ‘External Data’) that is accessed via 768

the MOVX/EMOV instructions using DPTR/EPTR

(00:0000-00:02FF)

For more detailed information, please refer to the P89C669 User Manual.

7.3 Special function registers

Special Function Register (SFR) accesses are restricted in the following ways:

• User must not attempt to access any SFR locations not defined.

• Accesses to any defined SFR locations must be strictly for the functions for the

SFRs.

• SFR bits labeled ‘-’, ‘0’, or ‘1’ can only be written and read as follows:

– ‘-’ must be written with ‘0’, but can return any value when read (even if it was

written with ‘0’). It is a reserved bit and may be used in future derivatives.

– ‘0’ must be written with ‘0’, and will return a ‘0’ when read.

– ‘1’ must be written with ‘1’, and will return a ‘1’ when read.

9397 750 12299

Product data

Rev. 02 — 13 November 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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