AT89C51SND2C-7FTUL Atmel, AT89C51SND2C-7FTUL Datasheet - Page 21

• Manufacturer Part Number: AT89C51SND2C-7FTUL
• Description: IC 8051 MCU FLASH 64K MP3 100BGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND2C-7FTUL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b; D/A 2x20b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: ATAPI, I2S, IDE, SPI, UART, USB
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT89C51SND2C7FTUL

6.4.2
6.4.3
Figure 6-4.
6.5
4341H–MP3–10/07
Preventing Flash Corruption
Hardware Condition Boot Mapping
Programmed Condition Boot Mapping
Hardware Boot Process Algorithm
The hardware condition is based on the ISP pin. When driving this pin to low level, the chip reset
sets ENBOOT and forces the reset vector to F000h instead of 0000h in order to execute the
boot loader software.
As shown in Figure 6-4 the hardware condition always allows in-system recovery when user’s
memory has been corrupted.
The programmed condition is based on the Boot Loader Jump Bit (BLJB) in HSB. As shown in
Figure 6-4 when this bit is programmed (by hardware or software programming mode), the chip
reset set ENBOOT and forces the reset vector to F000h instead of 0000h, in order to execute
the boot loader software.
The software process (boot loader) is detailed in the “Boot Loader Datasheet” Document.
See Section “Reset Recommendation to Prevent Flash Corruption”, page 48.
Application
Standard Init
ENBOOT = 0
FCON = F0h
PC = 0000h
User’s
Prog Cond Init
Boot Loader
ENBOOT = 1
Hard Cond?
Prog Cond?
FCON = F0h
PC = F000h
BLJB = P?
ISP = L?
Atmel’s
RESET
AT8xC51SND2C/MP3B
Hard Cond Init
ENBOOT = 1
FCON = 00h
PC = F000h
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