ATmega162 datasheet(245/324 Pages) ATMEL

245 / 324 page

245

2513K–AVR–07/09

ATmega162/V

Notes:

tWLRH is valid for the Write Flash, Write EEPROM, Write Fuse Bits and Write Lock Bits

commands.

tWLRH_CE is valid for the Chip Erase command.

Serial

Downloading

SPI Serial

Programming Pin

Mapping

Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus while

RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and MISO (out-

put). After RESET is set low, the Programming Enable instruction needs to be executed first

before program/erase operations can be executed. NOTE, in Table 108 on page 245, the pin

mapping for SPI programming is listed. Not all parts use the SPI pins dedicated for the internal

SPI interface.

Figure 105. SPI Serial Programming and Verify

(1)

Note:

1. If the device is clocked by the Internal Oscillator, it is no need to connect a clock source to the

XTAL1 pin.

When programming the EEPROM, an auto-erase cycle is built into the self-timed programming

operation (in the Serial mode ONLY) and there is no need to first execute the Chip Erase

instruction. The Chip Erase operation turns the content of every memory location in both the

Program and EEPROM arrays into 0xFF.

tBVDV

BS1 Valid to DATA valid

250

tOLDV

OE Low to DATA Valid

250

tOHDZ

OE High to DATA Tri-stated

250

Table 107. Parallel Programming Characteristics, V

CC = 5 V ± 10% (Continued)

Symbol

Parameter

Min

Typ

Max

Units

Table 108. Pin Mapping SPI Serial Programming

Symbol

Pins

I/O

Description

MOSI

PB5

Serial Data in

MISO

PB6

Serial Data out

SCK

PB7

Serial Clock

VCC

GND

XTAL1

SCK

MISO

MOSI

RESET

ATmega162 датащи(PDF) 245 Page - ATMEL Corporation

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