AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 113

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Table 24-10. API Call Summary (Continued)
4235K–8051–05/08
PROGRAM DATA PAGE
PROGRAM BLJB FUSE
READ BOOT VERSION
PROGRAM X2 FUSE
READ BOOT ID1
READ BOOT ID2
PROGRAM SSB
PROGRAM BSB
PROGRAM SBV
READ HSB
READ SSB
READ BSB
READ SBV
Command
0Ah
0Ah
0Bh
0Eh
0Eh
0Fh
05h
06h
06h
07h
07h
07h
09h
R1
Fuse value
00h or 01h
Fuse value
00h or 01h
Number of
New BSB
New SBV
program
byte to
value
value
XXh
XXh
XXh
XXh
XXh
XXh
XXh
XXh
A
to program in
the first byte
DPH = 00h
DPH = 00h
DPH = 00h
DPH = 00h
DPL = 00h
DPL = 01h
DPL = 10h
Address of
DPL = 00h
DPL = 01h
DPL = 11h
the Flash
memory
DPTR0
XXXXh
XXXXh
0000h
0001h
0000h
0001h
0002h
0008h
0004h
XRAM of the
first data to
Address in
program
DPTR1
XXh
XXh
XXh
XXh
XXh
XXh
XXh
XXh
XXh
XXh
XXh
00h
ACC = Boot_Version
ACC = SSB value
Returned Value
ACC = 0: DONE
ACC = HSB
ACC = SSB
ACC = BSB
ACC = SBV
ACC = ID1
ACC = ID2
none
none
none
none
single 128 bytes page. Hence, when ACC is
limited such as the Flash write remains in a
128, valid values of DPL are 00h, or, 80h.
AT89C51RD2/ED2
Remark: number of bytes to program is
Program up to 128 bytes in user Flash.
Program BLJB fuse bit with ACC
Program X2 fuse bit with ACC
Program software boot vector
Read Software Security Byte
Read Software Boot Vector
Program boot status byte
Read bootloader version
Read Boot Status Byte
Read Hardware Byte
Command Effect
Set SSB level 1
Set SSB level 2
Set SSB level 0
Set SSB level 1
Read boot ID1
Read boot ID2
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