Datasheet

286
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
25.7 Serial Programming Pin Mapping
Table 25-9. XA1 and XA0 Coding
XA1 XA0 Action when XTAL1 is Pulsed
00
Load Flash or EEPROM Address (High or low address byte determined by
BS1).
0 1 Load Data (High or Low data byte for Flash determined by BS1).
1 0 Load Command
1 1 No Action, Idle
Table 25-10. Command Byte Bit Coding
Command Byte Command Executed
1000 0000 Chip Erase
0100 0000 Write Fuse bits
0010 0000 Write Lock bits
0001 0000 Write Flash
0001 0001 Write EEPROM
0000 1000 Read Signature Bytes and Calibration byte
0000 0100 Read Fuse and Lock bits
0000 0010 Read Flash
0000 0011 Read EEPROM
Table 25-11. No. of Words in a Page and No. of Pages in the Flash
Device Flash Size Page Size PCWORD
No. of
Pages PCPAGE PCMSB
AT90PWM2/2B/3/
3B
4K words
(8K bytes)
32 words PC[4:0] 128 PC[11:5] 11
Table 25-12. No. of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM
Size
Page
Size PCWORD
No. of
Pages PCPAGE EEAMSB
AT90PWM2/2B/3/
3B
512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8
Table 25-13. Pin Mapping Serial Programming
Symbol Pins I/O Description
MOSI_A PD3 I Serial Data in
MISO_A PD2 O Serial Data out
SCK_A PD4 I Serial Clock