T89C51RC2_14 [ATMEL]
SBV and BSB Protection in ISP Mode;
| 型号： | T89C51RC2_14 |
| 厂家： | 
ATMEL |
| 描述： | SBV and BSB Protection in ISP Mode |
| 文件： | 总3页 (文件大小：50K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
5. Bad Interrupt Handling During an API Call
Interrupts are not disabled during all API process. This may cause interaction with software application interrupts using
MOVX instruction.
API functions always enable interrupts (set EA) before exiting. This may cause trouble if API is called from a software
program section requiring interrupts to be disabled.
Workaround
The software application should save and disable EA before an API call. On API return, the software application should
restore EA setting.
6. Program Data Byte and Data Page API Return Value
The PROGRAM DATA BYTE API and DATA PAGE API returns “01h” instead of “00” into the accumulator, when Flash
write process passed.
Workaround
The software application should take into account that return value is “01” with 1.1.1 bootloader version.
7. No Further ISP is Possible When OSCB Fuse Bit Set and 32 kHz are Connected to XTAL2 for T89C51IC2
Product Only
When OSCB fuse bit is set (written with 0), and XTAL2A/B pins connected to a 32 kHz oscillator, no serial ISP is
possible.
Workaround
Connect at least a 1.8432 MHz signal to XTAL2A pin.
2
T89C51RB2/RC2/IC2 Bootloader Errata Sheet
4187A–8051–10/02
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4187A–8051–10/02
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