Manual

15
AT86RF401
1424D–RKE–09/02
Data EEPROM Access from the AVR
Note: a = address high bits
b = address low bits
H =0:Lowbyte,1:Highbyte
o = data out
i = data in
x = don’tcare
1=lockbit1
2=lockbit2
Figure 4. Serial Programming and Verify
Notes: 1. When writing ,dataisclockedonthe rising edge of CLK.
2. When
reading , data is clocked on the falling edge of CLK. See Figure 5 for an
explanation.
Table 6. AT86RF401 Serial Programming Instruction Set
Instruction
Instruction Format
OperationByte 1 Byte 2 Byte 3 Byte 4
Programming
Enable
1010 1100 0101 0011 xxxx xxxx xxxx xxxx
Enable Serial Programming after
RESETB goes low.
Chip Erase
1010 1100 100x xxxx xxxx xxxx xxxx xxxx
Chip erase EEPROM
Read Program
Memory
0010 H000 0000 00aa bbbb bbbb oooo oooo
Read H (high or low) data o from Program
memory at word address a:b
Write Program
Memory
0100 H000 0000 00aa bbbb bbbb iiii iiii
Write H (highorlow)datai to Program
memory at word address a:b
Read
EEPROM
Memory
1010 0000 0000 0000 xbbb bbbb oooo oooo
Read data o from EEPROM memory at
address b
Write
EEPROM
Memory
1100 0000 0000 0000 xbbb bbbb iiii iiii
Write data i to EEPROM memory at
address b
Write Lock Bits
1010 1100 111x x 21 x xxxx xxxx xxxx xxxx
Write lock bits. Set bits 21 = “0” to
program lock bits.
I/O Read
10110000 0000 0000 00bbbbbb oooo oooo
Read data 0 from I/O memory address b
I/O Write
11010000 0000 0000 00bbbbbb iiii iiii
Write data i to I/O memory address b
BAT
SCK
SDO
SDI
RESETB
XTAL
XTALB
2.0–3.5V
CLOCK IN
DATA OUT
INSTR. IN, DATA IN
GND
6 to 20 MHz
AT86RF401