MC68HC11A1 MOTOROLA [Motorola, Inc], MC68HC11A1 Datasheet - Page 29

• Manufacturer Part Number: MC68HC11A1
• Description: 8-Bit Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

7 Serial Peripheral Interface (SPI)
DDRD — Data Direction Register for Port D
MC68HC11A8
MC68HC11A8TS/D
RESET:
Alt. Pin
Func.:
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.
SPI STATUS REGISTER
2
MCU CLOCK
INTERNAL
DIVIDER
SELECT
4
Bit 7
__
0
0
16
SPI CONTROL
32
__
6
0
0
SPI CLOCK (MASTER)
SPI INTERRUPT
REQUEST
DDD5
PD5/
SS
5
0
8
Figure 9 SPI Block Diagram
MSTR
SPE
DDD4
PD4/
DATA BUS
SCK
INTERNAL
MSB
4
0
8
8/16-BIT SHIFT REGISTER
READ DATA BUFFER
8
DDD3
MOSI
PD3/
3
0
SPI CONTROL REGISTER
CLOCK
DDD2
LOGIC
MISO
PD2/
2
0
LSB
CLOCK
DDD1
PD1/
TxD
1
0
$1009
DDD0
PD0/
Bit 0
RxD
S
M
M
S
S
M
0
MOTOROLA
11 SPI BLOCK
MISO
MOSI
SCK
PD2
PD3
PD4
PD5
SS
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