MC68HC11P2 Datasheet, PDF (127/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Serial Peripheral Interface (SPI)
SPI transfer formats
optionally be used to indicate a multiple master bus contention. Refer to
Figure 7-2.
MCU
system clock
Divider
÷2 ÷4 ÷8 ÷16 ÷32 ÷64 ÷128
8-bit shift register
Read data buffer
Shift control logic
Select
SPI clock (master)
Clock
logic
S
MISO
PD2
M
M
MOSI
S
PD3
Pin
control
logic
S
SCK
M
PD4
SS
PD5
OPT2 – Options register 2
SPI control
MSTR
SPE
SPIE
SPSR – SPI status register
SPI interrupt
request
SPCR – SPI control register
SPDR – SPI data register
Internal bus
Figure 7-1. SPI block diagram
MC68HC11P2 — Rev 1.0
Serial Peripheral Interface (SPI)
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Technical Data