AT89C51SND1C-7HTUL Atmel, AT89C51SND1C-7HTUL Datasheet - Page 23

• Manufacturer Part Number: AT89C51SND1C-7HTUL
• Description: IC MCU 64KB FLASH MEM 81-CBGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND1C-7HTUL

• 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: 44
• 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
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 81-CBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Figure 6-7.
6.6
6.7
4109L–8051–02/08
Preventing Flash Corruption
Registers
Hardware Boot Process Algorithm
The software process (boot loader) is detailed in the “Boot Loader Datasheet” Document.
See Section “Reset Recommendation to Prevent Flash Corruption”, page 49.
Table 22. AUXR1 Register
AUXR1 (S:A2h) – Auxiliary Register 1
Application
Standard Init
ENBOOT = 0
FCON = F0h
PC = 0000h
Number
User’s
7 - 6
Bit
7
5
4
-
Mnemonic Description
ENBOOT
Bit
6
-
-
-
1
Reserved
The value read from these bits are indeterminate. Do not set these bits.
Enable Boot Flash
Set this bit to map the boot Flash in the code space between at addresses F000h
to FFFFh.
Clear this bit to disable boot Flash.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
ENBOOT
Prog Cond Init
5
Boot Loader
ENBOOT = 1
Hard Cond?
Prog Cond?
FCON = F0h
PC = F000h
BLJB = P?
ISP = L?
Atmel’s
RESET
4
-
GF3
3
Hard Cond Init
ENBOOT = 1
FCON = 00h
PC = F000h
AT8xC51SND1C
2
0
1
-
DPS
0
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