Datasheet
Table Of Contents
- Features
- Description
- Block Diagram
- SFR Mapping
- Pin Configurations
- Oscillators
- Enhanced Features
- Dual Data Pointer Register DPTR
- Expanded RAM (XRAM)
- Reset
- Power Monitor
- Timer 2
- Programmable Counter Array PCA
- Serial I/O Port
- Interrupt System
- Power Management
- Keyboard Interface
- 2-wire Interface (TWI)
- Serial Port Interface (SPI)
- Hardware Watchdog Timer
- ONCE(TM) Mode (ON Chip Emulation)
- Power-off Flag
- EEPROM Data Memory
- Reduced EMI Mode
- Flash Memory
- Electrical Characteristics
- Absolute Maximum Ratings
- DC Parameters
- AC Parameters
- Explanation of the AC Symbols
- External Program Memory Characteristics
- External Program Memory Read Cycle
- External Data Memory Characteristics
- External Data Memory Write Cycle
- External Data Memory Read Cycle
- Serial Port Timing - Shift Register Mode
- Shift Register Timing Waveforms
- External Clock Drive Waveforms
- AC Testing Input/Output Waveforms
- Float Waveforms
- Clock Waveforms
- Ordering Information
- Packaging Information
- Table of Contents
134
AT89C51ID2
4289C–8051–11/05
Example
Read Function This flow is similar for the following frames:
• Reading Frame
• EOF Frame/ Atmel Frame (only reading Atmel Frame)
Description
Figure 56. Read Flow
HOST : 05 0000 04 0000 0020 00 D7
BOOTLOADER
: 05 0000 04 0000 0020 00 D7
BOOTLOADER 0000=-----data------ CR LF (16 data)
BOOTLOADER
0010=-----data------ CR LF (16 data)
BOOTLOADER 0020=data CR LF ( 1 data)
Display data from address 0000h to 0020h
Host
Bootloader
Read Command
’X’ & CR & LF
RD_WR_SECURITY
Wait Read Command
Read Value
Send Security error
Send Data Read
Send Read Command
Wait Checksum Error
Wait Value of Data
Wait Security Error
OR
COMMAND ABORTED
COMMAND FINISHED
Send Checksum error
COMMAND ABORTED
’L’ & CR & LF
OR
’value’ & ’.’ & CR & LF
Checksum error