at90ls8535-8mi ATMEL Corporation, at90ls8535-8mi Datasheet - Page 94

• Manufacturer Part Number: at90ls8535-8mi
• Description: 8-bit Microcontroller With 8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

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