Datasheet > T89C51IC2_14

T89C51IC2_14

更新时间： 2024-10-01 01:15:23

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
3页	50K
描述
No Active Erratas in Latest Version of Bootloader

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数据手册

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T89C51IC2_14 数据手册

Active Errata List

• No Active Erratas in Latest Version of Bootloader.

Errata History

Bootloader Version

Errata List

1.1.1

1.2.0

1, 2, 3, 4, 5, 6, 7

All known troubles fixed

80C51

Microcontrollers

Errata Descriptions

1. ISP Command Read Data

In response to an ISP Command Read Data, the bootloader sends the last data

frame with stuffing bytes (FFh) to keep 16-byte frame length.

T89C51RC2

T89C51RB2

T89C51IC2

Bootloader

Workaround

ISP software host application should ignore these stuffing data bytes.

2. SBV and BSB Protection in ISP Mode

SBV and BSB modification are possible regardless of security level settings

(SSB).

Workaround

Errata Sheet

The ISP software host application should read the SSB value before allowing any

SBV and BSB modification according to the SSB setting.

3. Fuse Bits (X2, BLJB and OSCB for IC2 Product ) Protection in ISP Mode

Any fuse bits modification (read or write access) are possible regardless of secu-

rity level settings (SSB).

Workaround

The ISP software host application should read the SSB value before allowing any

fuse bits modification according to the SSB setting.

4. Unexpected Response from Bootloader When a Security Level Change is

Requested from the ISP Software Host Application

If the security levels are set to 1 or 2, the bootloader returns “.” instead of “P” over

the serial line when the ISP software host application requests lower security level

settings. However, the bootloader does not process the request and the current

security level is not modified.

Workaround

The ISP software host application should not request inconsistent security level

modification. If not possible, it should ignore the bootloader response.

Rev. 4187A–8051–10/02

12 3

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