Datasheet

Functional Description
MC68HC908GR16A Data Sheet, Rev. 1.0
Freescale Semiconductor 193
Figure 16-2. SPI Module Block Diagram
Addr.Register Name Bit 7654321Bit 0
$0010
SPI Control Register
(SPCR)
See page 207.
Read:
SPRIE R SPMSTR CPOL CPHA SPWOM SPE SPTIE
Write:
Reset:00101000
$0011
SPI Status and Control
Register (SPSCR)
See page 208.
Read: SPRF
ERRIE
OVRF MODF SPTE
MODFEN SPR1 SPR0
Write:
Reset:00001000
$0012
SPI Data Register
(SPDR)
See page 210.
Read: R7 R6 R5 R4 R3 R2 R1 R0
Write: T7 T6 T5 T4 T3 T2 T1 T0
Reset: Unaffected by reset
R
= Reserved
= Unimplemented
Figure 16-3. SPI I/O Register Summary
TRANSMITTER CPU INTERRUPT REQUEST
RECEIVER/ERROR CPU INTERRUPT REQUEST
76543210
SPR1
SPMSTR
TRANSMIT DATA REGISTER
SHIFT REGISTER
SPR0
CLOCK
SELECT
÷ 2
CLOCK
DIVIDER
÷ 8
÷ 32
÷ 128
CLOCK
LOGIC
CPHA CPOL
SPI
SPRIE
SPE
SPWOM
SPRF
SPTE
OVRF
M
S
PIN
CONTROL
LOGIC
RECEIVE DATA REGISTER
SPTIE
SPE
INTERNAL BUS
BUSCLK
MODFEN
ERRIE
CONTROL
MODF
SPMSTR
MOSI
MISO
SPSCK
SS