MC68HC908EY16 Datasheet, PDF (171/278 Pages) Motorola, Inc – Microcontrollers

Table 15-2. I/O Register Addresses
Register Name
SPI control register (SPCR)
SPI status and control register (SPSCR)
SPI data register (SPDR)
Address
$000D
$000E
$000F
15.4 Functional Description
Figure 15-2 shows the structure of the SPI module.
INTERNAL BUS
Functional Description
TRANSMIT DATA REGISTER
BUS CLOCK
÷2
CLOCK ^{÷ 8}
DIVIDER _{÷ 32}
÷ 128
SHIFT REGISTER
76543210
RECEIVE DATA REGISTER
SPMSTR SPE
CLOCK
SELECT
SPR1 SPR0
CLOCK
LOGIC
PIN
CONTROL
LOGIC
M
S
SPMSTR CPHA CPOL
MISO
MOSI
SPSCK
SS
TRANSMITTER CPU INTERRUPT REQUEST
RECEIVER/ERROR CPU INTERRUPT REQUEST
SPI
CONTROL
MODFEN
ERRIE
SPTIE
SPRIE
SPWOM
SPE
SPRF
SPTE
OVRF
MODF
Figure 15-2. SPI Module Block Diagram
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
Freescale Semiconductor
171