G. Load address high byte
1. Set XA1, XA0 to “00”. This enables address loading.
2. Set BS1 to “1”. This selects high address.
3. Set DATA = Address high byte (0x00 - 0xFF).
4. Give XTAL1 a positive pulse. This loads the address high byte.
H. Program page
1. Give WR a negative pulse. This starts programming of the entire page of data. RDY/BSY goes low.
2. Wait until RDY/BSY goes high (See Figure 25-3 for signal waveforms).
I. Repeat B through H until the entire flash is programmed or until all data has been programmed.
J. End page programming
1. 1. Set XA1, XA0 to “10”. This enables command loading.
2. Set DATA to “0000 0000”. This is the command for no operation.
3. Give XTAL1 a positive pulse. This loads the command, and the internal write signals are reset.
Figure 25-2. Addressing the Flash which is Organized in Pages(1)
PCMSB
PAGEMSB
PCWORD
PROGRAM
COUNTER
PCPAGE
Page address
within the flash
Word address
within page
Program Memory
Page
Page
PCWORD [PAGEMSB:0]
00
Instructions Word
01
02
PAGEEND
Note:
1. PCPAGE and PCWORD are listed in Table 25-12 on page 260.
ATmega16/32/64/M1/C1 [DATASHEET]
263
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
