at89lp216-20xi ATMEL Corporation, at89lp216-20xi Datasheet - Page 74

• Manufacturer Part Number: at89lp216-20xi
• Description: At89lp216 8-bit Microcontroller With 2k Bytes Flash
• Manufacturer: ATMEL Corporation

23.8.5
74
AT89LP216
Serial Peripheral Interface
The Serial Peripheral Interface (SPI) is a byte-oriented full-duplex synchronous serial communi-
cation channel. During In-System Programming, the programmer always acts as the SPI master
and the target device always acts as the SPI slave. The target device receives serial data on
MOSI and outputs serial data on MISO. The Programming Interface implements a standard
SPI Port with a fixed data order and For In-System Programming, bytes are transferred MSB
first as shown in
CPHA = 0) where bits are sampled on the rising edge of SCK and output on the falling edge of
SCK. For more detailed timing information see
Figure 23-9. ISP Byte Sequence
Figure 23-10. Serial Programming Interface Timing
MISO
MOSI
SCK
SS
MOSI
MISO
SCK
Figure
t
SSE
t
SOE
23-9. The SCK phase and polarity follow SPI clock mode 0 (CPOL = 0,
7
7
t
SHSL
6
6
t
SCK
Data Sampled
t
5
5
t
SLSH
SR
t
SOV
Figure
4
4
t
SOH
23-10.
3
3
t
SF
2
2
t
SIS
1
1
t
SIH
3621B–MICRO–11/07
t
SSD
0
0
t
SOX