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AT90S8535 Datasheet(PDF) 94 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 94 Page - ATMEL Corporation |
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94 / 127 page  94 AT90S/LS8535 1041H–11/01 Enter Programming Mode The following algorithm puts the device in Parallel Programming Mode: 1. Apply supply voltage according to Table 36, between VCC and GND. 2. Set the RESET and BS pin to “0” and wait at least 100 ns. 3. Apply 11.5 - 12.5V to RESET. Any activity on BS within 100 ns after +12V has been applied to RESET, will cause the device to fail entering programming mode. Table 37. Pin Name Mapping Signal Name in Programming Mode Pin Name I/O Function RDY/BSY PD1 O 0: Device is busy programming, 1: Device is ready for new command OE PD2 I Output Enable (Active low) WR PD3 I Write Pulse (Active low) BS PD4 I Byte Select (“0” selects low byte, “1” selects high byte) XA0 PD5 I XTAL Action Bit 0 XA1 PD6 I XTAL Action Bit 1 DATA PB7 - 0 I/O Bi-directional Data Bus (Output when OE is low) Table 38. XA1 and XA0 Coding XA1 XA0 Action when XTAL1 is Pulsed 0 0 Load Flash or EEPROM Address (high or low address byte determined by BS) 0 1 Load Data (High or low data byte for Flash determined by BS) 1 0 Load Command 1 1 No Action, Idle Table 39. Command Byte Bit Coding Command Byte Command Executed 1000 0000 Chip Erase 0100 0000 Write Fuse Bits 0010 0000 Write Lock Bits 0001 0000 Write Flash 0001 0001 Write EEPROM 0000 1000 Read Signature Bytes 0000 0100 Read Lock and Fuse Bits 0000 0010 Read Flash 0000 0011 Read EEPROM |
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