ATMEGA8535L-8AC Atmel, ATMEGA8535L-8AC Datasheet - Page 240

• Manufacturer Part Number: ATMEGA8535L-8AC
• Description: IC AVR MCU 8K LV 8MHZ COM 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8535L-8AC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Parallel Programming
Parameters, Pin
Mapping, and
Commands
Signal Names
240
ATmega8535(L)
This section describes how to parallel program and verify Flash Program memory,
EEPROM Data memory, Memory Lock bits, and Fuse bits in the ATmega8535. Pulses
are assumed to be at least 250 ns unless otherwise noted.
In this section, some pins of the ATmega8535 are referenced by signal names describ-
ing their functionality during parallel programming, see Figure 115 and Table 100. Pins
not described in the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a posi-
tive pulse. The bit coding is shown in Table 102.
When pulsing WR or OE, the command loaded determines the action executed. The dif-
ferent Commands are shown in Table 103.
Figure 115. Parallel Programming
Table 100. Pin Name Mapping
Signal Name in
Programming Mode
RDY/BSY
OE
WR
BS1
XA0
XA1
PAGEL
BS2
DATA
RDY/BSY
PAGEL
Pin Name
+12 V
PB7 - 0
BS1
XA0
XA1
BS2
WR
OE
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PA0
I/O
I/O
O
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
PA0
I
I
I
I
I
I
I
Function
0: Device is busy programming, 1: Device is ready
for new command
Output Enable (Active low)
Write Pulse (Active low)
Byte Select 1 (“0” selects low byte, “1” selects high
byte)
XTAL Action Bit 0
XTAL Action Bit 1
Program Memory and EEPROM data Page Load
Byte Select 2 (“0” selects low byte, “1” selects 2’nd
high byte)
Bi-directional Data bus (Output when OE is low)
PB7 - PB0
AVCC
VCC
+5V
DATA
2502K–AVR–10/06