Rainbow-electronics ATmega32L Bedienungsanleitung PDF herunterladen (Seite 268)

268

ATmega32(L)

2503C–AVR–10/02

Notes: 1. t

WLRH

is valid for the Write Flash, Write EEPROM, Write Fuse bits and Write Lock

bits commands.

2. t

WLRH_CE

is valid for the Chip Erase command.

SPI Serial Downloading 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 (output). After RESET

is set low, the Programming Enable instruction

needs to be executed first before program/erase operations can be executed. NOTE, in

Table 114 on page 268, the pin mapping for SPI programming is listed. Not all parts use

the SPI pins dedicated for the internal SPI interface.

SPI Serial Programming

Pin Mapping

Figure 136. SPI Serial Programming and Verify

(1)

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

source to the XTAL1 pin.

2. V

-0.3V < AVCC < V

+0.3V, however, AVCC should always be within 2.7 - 5.5V

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

gramming operation (in the serial mode ONLY) and there is no need to first execute the

BVDV

BS1 Valid to DATA valid 0 250 ns

OLDV

OE Low to DATA Valid 250 ns

OHDZ

OE High to DATA Tri-stated 250 ns

Table 113. Parallel Programming Characteristics, V

= 5 V ± 10% (Continued)

Symbol Parameter Min Typ Max Units

Table 114. Pin Mapping SPI Serial Programming

Symbol Pins I/O Description

MOSI PB5 I Serial Data in

MISO PB6 O Serial Data out

SCK PB7 I Serial Clock

VCC

GND

XTAL1

SCK

MISO

MOSI

RESET

PB5

PB6

PB7

+2.7 - 5.5V

VCC

+2.7 - 5.5V

(2)

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