AT90LS8535-4MC Atmel, AT90LS8535-4MC Datasheet - Page 95
![IC MCU 8K FLASH 4MHZ COM 44-QFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
AT90LS8535-4MC
Manufacturer Part Number
AT90LS8535-4MC
Description
IC MCU 8K FLASH 4MHZ COM 44-QFN
Manufacturer
Atmel
Series
AVR® 90LSr
Specifications of AT90LS8535-4MC
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
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 ~ 6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Chip Erase
Programming the Flash
1041H–11/01
The Chip Erase command will erase the Flash and EEPROM memories and the Lock
bits. The Lock bits are not reset until the Flash and EEPROM have been completely
erased. The Fuse bits are not changed. Chip Erase must be performed before the Flash
or EEPROM is reprogrammed.
Load Command “Chip Erase”:
1. Set XA1, XA0 to “10”. This enables command loading.
2. Set BS to “0”.
3. Set DATA to “1000 0000”. This is the command for Chip Erase.
4. Give XTAL1 a positive pulse. This loads the command.
5. Give WR a
A: Load Command “Write Flash”
1. Set XA1, XA0 to “10”. This enables command loading.
2. Set BS to “0”.
3. Set DATA to “0001 0000”. This is the command for Write Flash.
4. Give XTAL1 a positive pulse. This loads the command.
B: Load Address High Byte
1. Set XA1, XA0 to “00”. This enables address loading.
2. Set BS to “1”. This selects high byte.
3. Set DATA = Address high byte ($00 - $0F).
4. Give XTAL1 a positive pulse. This loads the address high byte.
C: Load Address Low Byte
1. Set XA1, XA0 to “00”. This enables address loading.
2. Set BS to “0”. This selects low byte.
3. Set DATA = Address low byte ($00 - $FF).
4. Give XTAL1 a positive pulse. This loads the address low byte.
D: Load Data Low Byte
1. Set XA1, XA0 to “01”. This enables data loading.
2. Set DATA = Data low byte ($00 - $FF).
3. Give XTAL1 a positive pulse. This loads the data low byte.
E: Write Data Low Byte
1. Set BS to “0”. This selects low data.
2. Give WR a negative pulse. This starts programming of the data byte. RDY/BSY
3. Wait until RDY/BSY goes high to program the next byte.
(See Figure 68 for signal waveforms.)
F: Load Data High Byte
1. Set XA1, XA0 to “01”. This enables data loading.
2. Set DATA = Data high byte ($00 - $FF).
3. Give XTAL1 a positive pulse. This loads the data high byte.
G: Write Data High Byte
for
pin.
goes low.
t
WLWH_CE
value. Chip Erase does not generate any activity on the RDY/BSY
t
WLWH_CE
-wide negative pulse to execute Chip Erase. See Table 40
AT90S/LS8535
95
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