AT89LS52-16SC ATMEL [ATMEL Corporation], AT89LS52-16SC Datasheet - Page 23

• Manufacturer Part Number: AT89LS52-16SC
• Description: 8-bit Low-Voltage Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

19.1
19.2
2601B–MICRO–03/05
Serial Programming Algorithm
Serial Programming Instruction Set
To program and verify the AT89LS52 in the serial programming mode, the following sequence is
recommended:
If a crystal is not connected across pins XTAL1 and XTAL2, apply a 3 MHz to 16 MHz clock to
XTAL1 pin and wait for at least 10 milliseconds.
Power-off sequence (if needed):
Data Polling: The Data Polling feature is also available in the serial mode. In this mode, during
a byte write cycle an attempted read of the last byte written will result in the complement of the
MSB of the serial output byte on MISO.
The Instruction Set for Serial Programming follows a 4-byte protocol and is shown in
1. Power-up sequence:
2. Enable serial programming by sending the Programming Enable serial instruction to pin
3. The Code array is programmed one byte at a time in either the Byte or Page mode. The
4. Any memory location can be verified by using the Read instruction which returns the
5. At the end of a programming session, RST can be set low to commence normal device
1. Set XTAL1 to “L” (if a crystal is not used).
2. Set RST to “L”.
3. Turn V
a. Apply power between VCC and GND pins.
b. Set RST pin to “H”.
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 16.
write cycle is self-timed and typically takes less than 1 ms at 2.7V.
content at the selected address at serial output MISO/P1.6.
operation.
CC
power off.
AT89LS52
Table
22-1.
23