Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 135)

135

8052B–AVR–09/08

ATmega4HVD/8HVD

Figure 24-2. Serial Programming Instruction example

24.7 High-voltage Serial Programming

This section describes how to program and verify Flash Program memory, EEPROM Data

memory, Lock bits and Fuse bits in the ATmega4HVD/8HVD.

The prog_enable minimum period for the Serial Clock Input (SCI) during High-voltage Serial

Programming is 220 ns.

Byte 1 Byte 2 Byte 3 Byte 4

Adr LSB

Bit 15 B 0

Serial Programming Instruction

Program Memory/

EEPROM Memory

Page 0

Page 1

Page 2

Page N-1

Page Buffer

Write Program Memory Page/

Write EEPROM Memory Page

Load Program Memory Page (High/Low Byte)/

Load EEPROM Memory Page (page access)

Byte 1 Byte 2 Byte 3 Byte 4

Bit 15 B 0

Adr MSB

Page Offset

Page Number

r M

Adr

r L

LSB

Table 24-11. Pin Name Mapping

Signal Name in High-voltage

Serial Programming Mode Pin Name I/O Function

SDO PB1 O Serial Data Output

SDI PC1 I Serial Data Input

SII PB0 I Serial Instruction Input

SCI PC0 I Serial Clock Input (min. 220ns period)

Table 24-12. Pin Values Used to Enter Programming Mode

Symbol Pin Name Value

Prog_enable[0] PB0 0

Prog_enable[1] PB1 0

Prog_enable[2] NC 0

Prog_enable[3] PB2 0

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 167 168

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