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7656A–MP3–04/07

MP3

Microcontrollers

AT85C51SND3Bx

Errata Sheet

Active AT85C51SND3Bx Errata List

•

I/O Ports – P0, P2, P4, P5 Read-Modify-Write

•

SIO Interface – Low Baudrate Data Reception Ready Report

•

SPI Interface – DFC Usage Limitation

•

Battery Monitor – Bad Conversion Linearity

•

ISP – ISP Entry When Blanked Nand Flash

•

ISP – ISP USB enumeration on Windows

™

AT85C51SND3Bx Errata History

AT85C51SND3Bx Errata Description

1. I/O Ports – P0, P2, P4, P5 Read-Modify-Write

The P0, P2, P4, P5 implementation may lead to Input lock-up when using read-

modify-write (RMW) instructions:

ANL (logical AND, e.g., ANL P2,A)

ORL (logical OR, e.g., ORL P2,A)

XRL (logical EX-OR, e.g., XRL P2,A)

JBC (jump if bit set and clear bit, e.g., JBC P2.1, LABEL)

CPL (complement bit, e.g., CPL P2.0)

INC (increment, e.g., INC P2)

DEC (decrement, e.g., DEC P2)

DJNZ (decrement and jump if not zero, e.g., DJNZ P2, LABEL)

MOV PX.Y,C (move carry bit to bit Y of Port X)

CLR PX.Y (clear bit Y of Port X)

SETB PX.Y (set bit Y of Port X)

Here is a normal I/O port RMW execution sequence:

– Read the I/O port SFR (latch)

– Modify the data

– Write back the modified data to port SFR

Now here is what is really executed, these instructions that should read the inter-

nal latch read in fact the port data:

– Read the I/O port data

– Modify the data

– Write back the modified data to port SFR

Here is a detailed example:

P0.0 is used as input (set low by external hardware) while other P0 I/O are used

as output.

Following code may set P0.1 and leave other bits unaffected:

setb P0.1;

– before executing, P0 SFR= 1111 1101; P0 port= 1111 1100

Lot Number Errata List

All 1, 2, 3, 4, 5, 6

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Resumo do Conteúdo

Página 1 - Microcontrollers

7656A–MP3–04/07MP3 MicrocontrollersAT85C51SND3BxErrata SheetActive AT85C51SND3Bx Errata List•I/O Ports – P0, P2, P4, P5 Read-Modify-Write•SIO Interfac

Página 2 - 7656A–MP3–04/07

27656A–MP3–04/07– after executing, P0 SFR= 1111 1110; P0 port= 1111 1110Now P0.0 is no more programmed as input. The latch content is set to 0 meaning

Página 3

37656A–MP3–04/076. ISP – ISP USB enumeration on Windows™ XPWhen connecting the device to windows XP, an informational pop-up is opened near the status

Página 4 - Regional Headquarters

Printed on recycled paper.Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Co

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Atmel AT85RFD-07 Manual do Utilizador

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