MC68HC11KA Motorola, MC68HC11KA Datasheet - Page 44

• Manufacturer Part Number: MC68HC11KA
• Description: 8-Bit Microcontroller
• Manufacturer: Motorola

8 Serial Peripheral Interface
44
MOTOROLA
The SPI allows the MCU to communicate synchronously with peripheral devices and other micropro-
cessors. Data rates can be as high as 2 Mbits per second when configured as a master and 4 Mbits per
second when configured as a slave (assuming 4 MHz bus speed).
Two control bits in OPT2 allow the transfer of data either MSB or LSB first and select an additional divide
by four stage to be inserted before the SPI baud rate clock divider.
SPI STATUS REGISTER
2
MCU CLOCK
INTERNAL
DIVIDER
SELECT
4
16
SPI CONTROL
32
SPI CLOCK (MASTER)
SPI INTERRUPT
REQUEST
8
Figure 12 SPI Block Diagram
MSTR
SPE
DATA BUS
INTERNAL
MSB
8
8/16-BIT SHIFT REGISTER
READ DATA BUFFER
8
SPI CONTROL REGISTER
CLOCK
LOGIC
LSB
CLOCK
S
M
M
S
S
M
MC68HC11KA4TS/D
MC68HC11KA4
SPI BLOCK 2SPR
MISO
MOSI
SCK
PD2
PD3
PD4
PD5
SS