AT89LS8252-12JC Atmel, AT89LS8252-12JC Datasheet - Page 20

• Manufacturer Part Number: AT89LS8252-12JC
• Description: IC MICRO CTRL 12MHZ 44PLCC
• Manufacturer: Atmel
• Series: 89LSr

Specifications of AT89LS8252-12JC

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: AT89LS825212JC

Serial Programming Algorithm
To program and verify the AT89LS8252 in the serial pro-
gramming mode, the following sequence is recommended:
1. Power-up sequence:
2. Enable serial programming by sending the Pro-
3. The Code or Data array is programmed one byte at
20
Instruction Set
Notes:
Instruction
Programming Enable
Chip Erase
Read Code Memory
Write Code Memory
Read Data Memory
Write Data Memory
Write Lock Bits
Apply power between V
Set RST pin to “H”.
If a crystal is not connected across pins XTAL1 and
XTAL2, apply a 3 MHz to 12 MHz clock to XTAL1 pin
and wait for at least 10 milliseconds.
gramming Enable serial instruction to pin MOSI/
P1.5. The frequency of the shift clock supplied at
pin SCK/P1.7 needs to be less than the CPU clock
at XTAL1 divided by 40.
a time by supplying the address and data together
with the appropriate Write instruction. The selected
memory location is first automatically erased before
1. DATA polling is used to indicate the end of a write cycle which typically takes less than 10 ms at 2.7V.
2. “aaaaa” = high order address.
3. “x” = don’t care.
AT89LS8252
1010 1100
1010 1100
aaaa a001
aaaa a010
00aa a101
00aa a110
1010 1100
CC
Byte 1
and GND pins.
Input Format
0101 0011
xxxx x100
low addr
low addr
low addr
low addr
Byte 2
x x111
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
data in
data in
Byte 3
4. Any memory location can be verified by using the
5. At the end of a programming session, RST can be
Power-off sequence (if needed):
Serial Programming Instruction
The Instruction Set for Serial Programming follows a 3-byte
protocol and is shown in the following table:
Operation
Enable serial programming interface after RST goes
high.
Chip erase both 8K & 2K memory arrays.
Read data from Code memory array at the selected
address. The 5 MSBs of the first byte are the high order
address bits. The low order address bits are in the
second byte. Data are available at pin MISO during the
third byte.
Write data to Code memory location at selected
address. The address bits are the 5 MSBs of the first
byte together with the second byte.
Read data from Data memory array at selected
address. Data are available at pin MISO during the third
byte.
Write data to Data memory location at selected address.
Write lock bits.
Set LB1, LB2 or LB3 = “0” to program lock bits.
Set XTAL1 to “L” (if a crystal is not used).
Set RST to “L”.
Turn V
new data is written. The write cycle is self-timed and
typically takes less than 2.5 ms at 5V and less than
10 ms at 2.7V.
Read instruction which returns the content at the
selected address at serial output MISO/P1.6.
set low to commence normal operation.
CC
power off.
0850C–MICRO–3/06