AT89LP213_08 Datasheet, PDF (54/96 Pages) ATMEL Corporation – 8-bit Microcontroller with 2K Bytes Flash

Figure 18-2. SPI Shift Register Diagram
7
Serial In
8
2:1
MUX
Serial Master
D
Q
LATCH
CLK
Transmit
Byte
8
Parallel Master
(Write Buffer)
8
D
Q
LATCH
CLK
2:1
MUX
Serial Slave
D
Q
LATCH
CLK
Serial Out
Parallel Slave
(Read Buffer) Receive
Byte
8
D
Q⁸
LATCH
CLK
Figure 18-3. SPI Block Diagram
S
Oscillator
M
M
MSB
LSB
S
8-bit Shift Register
Divider
÷4÷8÷32÷64
Read Data Buffer
Write Data Buffer
Select
SPI Clock (Mater)
Clock
Clock
S
Logic
M
MISO
P1.6
MOSI
P1.5
SCK
1.7
SS
P1.4
SPI Control
SPI Status Register
MSTR
SPE
8
SPI Control Register
8
8
SPI Interrupt Internal
Request Data Bus
54 AT89LP213/214
3538C–MICRO–06/08