PXAS30 datasheet(48/52 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

XA-S3

XA 16-bit microcontroller

32 K/1 K OTP/ROM/ROMless, 8-channel 8-bit A/D, low voltage (2.7 V–5.5 V),

I2C, 2 UARTs, 16 MB address range

2000 Dec 01

EPROM CHARACTERISTICS

The XA-S3 is programmed by using a modified Improved

Quick-Pulse Programming

™ algorithm. This algorithm is essentially

the same as that used by 80C51 family EPROM parts. However

different pins are used for many programming functions.

The XA-S3 contains three signature bytes that can be read and

used by an EPROM programming system to identify the device. The

signature bytes identify the device as an XA-S3 manufactured by

Philips.

Security Bits

With none of the security bits programmed the code in the program

memory can be verified. When only security bit 1 is programmed,

MOVC instructions executed from external program memory are

disabled from fetching code bytes from the internal memory. All

further programming of the EPROM is disabled. When security bits

1 and 2 are programmed, in addition to the above, verify mode is

disabled. When all three security bits are programmed, all of the

conditions above apply and all external program memory execution

is disabled. (See Table 6.)

Table 6. Program Security Bits

PROGRAM LOCK BITS

SB1

SB2

SB3

PROTECTION DESCRIPTION

No Program Security features enabled.

MOVC instructions executed from external program memory are disabled from fetching code bytes

from internal memory and further programming of the EPROM is disabled.

Same as 2, also verify is disabled.

Same as 3, external execution is disabled. Internal data RAM is not accessible.

NOTES:

1. P – programmed. U – unprogrammed.

2. Any other combination of the security bits is not defined.

ROM CODE SUBMISSION

When submitting ROM code for the XA-S3, the following must be specified:

1. 32k byte user ROM data

2. ROM security bits.

ADDRESS

CONTENT

BIT(S)

COMMENT

0000H to 7FFFH

DATA

7:0

User ROM Data

8020H

SEC

ROM Security Bit 1

8020H

SEC

ROM Security Bit 2

0 = enable security

1 = disable security

8020H

SEC

ROM Security Bit 3

0 = enable security

1 = disable security

™Trademark phrase of Intel Corporation.

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