AT89LP4052 Atmel Corporation, AT89LP4052 Datasheet - Page 76

• Manufacturer Part Number: AT89LP4052
• Manufacturer: Atmel Corporation

Specifications of AT89LP4052

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 15
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 2
• Isp: SPI
• Watchdog: Yes

23.5.4
23.5.5
76
AT89LP2052/LP4052
ISP Exit Sequence
ISP Byte Sequence
Execute this sequence to exit ISP and resume execution.
Figure 23-25. In-System Programming (ISP) Exit Sequence
Note:
The ISP byte sequence is shown in
Figure 23-26. ISP Byte Sequence
1. Bring SS (P1.4) to “H”.
2. Tri-state MOSI (P1.5).
3. Tri-state SCK (P1.7).
4. Bring RST to “L”.
5. Tri-state SS.
• Data shifts in/out MSB first.
• MISO changes at falling edge of SCK.
• MOSI is sampled at rising edge of SCK.
The waveforms on this page are not to scale.
MOSI
MISO
SCK
XTAL1
MISO
MOSI
RST
SCK
V
SS
CC
7
7
6
6
Data Sampled
Figure
5
5
23-26.
4
4
HIGH Z
HIGH Z
3
3
2
2
1
1
3547J–MICRO–10/09
0
0