PIC16F872T-E/SO【PDF 55/167 页】IC MCU CMOS 20MHZ 2K FLSH 28SOIC

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149

8048C–AVR–02/12

ATtiny43U

Figure 19-3. Programming the Flash Waveforms

(1)

Note:

1. “XX” is don’t care. The letters refer to the programming description above.

I. Repeat B through H until the entire Flash is programmed or until all data has been

programmed.

J. End Page Programming

1. Set XA1, XA0 to “10”. This enables command loading.

Set DATA to “0000 0000”. This is the command for No Operation.

Give CLKI a positive pulse. This loads the command, and the internal write signals are

reset.

19.6.5

Programming the EEPROM

The EEPROM is organized in pages, see Table 19-9 on page 144. When programming the

EEPROM, the program data is latched into a page buffer. This allows one page of data to be

programmed simultaneously. The programming algorithm for the EEPROM data memory is as

follows (refer to “Programming the Flash” on page 147 for details on Command, Address and

Data loading):

A: Load Command “0001 0001”.

G: Load Address High Byte (0x00 - 0xFF).

B: Load Address Low Byte (0x00 - 0xFF).

C: Load Data (0x00 - 0xFF).

E: No action.

K: Repeat 3 through 5 until the entire buffer is filled.

L: Program EEPROM page

Set BS1 to “0”.

Give WR a negative pulse. This starts programming of the EEPROM page. RDY/BSY

goes low.

Wait until to RDY/BSY goes high before programming the next page (See Figure 19-4

for signal waveforms).

RDY/BSY

RESET +12V

0x10

ADDR. LOW

ADDR. HIGH

DATA

DATA LOW

DATA HIGH

ADDR. LOW

DATA LOW

DATA HIGH

XA1/BS2

XA0

PAGEL/BS1

CLKI

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