參數(shù)資料
型號: MC68HCP11
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontrollers
中文描述: 8位微控制器
文件頁數(shù): 29/45頁
文件大?。?/td> 286K
代理商: MC68HCP11
MC68HC11A8
MC68HC11A8TS/D
MOTOROLA
29
7 Serial
Peripheral
Interface
(SPI)
The SPI is one of two independent serial communications subsystems that allow the MCU to commu-
nicate synchronously with peripheral devices and other microprocessors. Data rates can be as high as
one half of the E-clock rate when configured as master, and as fast as the E clock when configured as
slave.
Figure 9 SPI Block Diagram
DDRD
— Data Direction Register for Port D
$1009
Bit 7
0
0
__
6
0
0
__
5
4
3
2
1
Bit 0
DDD0
0
PD0/
RxD
DDD5
0
PD5/
SS
DDD4
0
PD4/
SCK
DDD3
0
PD3/
MOSI
DDD2
0
PD2/
MISO
DDD1
0
PD1/
TxD
RESET:
Alt. Pin
Func.:
11 SPI BLOCK
S
S
C
C
M
D
S
S
SPI CONTROL REGISTER
M
W
S
SPI STATUS REGISTER
8/16-BIT SHIFT REGISTER
READ DATA BUFFER
MSB
LSB
INTERNAL
DATA BUS
SPI INTERRUPT
REQUEST
MSTR
SPE
M
D
S
S
SPI CLOCK (MASTER)
SPI CONTROL
SELECT
DIVIDER
÷
4
INTERNAL
MCU CLOCK
CLOCK
LOGIC
CLOCK
P
S
M
S
M
M
S
MISO
PD2
MOSI
PD3
SCK
PD4
SS
PD5
S
÷
2
÷
16
÷
32
8
8
8
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