MC908AB32CFUE Datasheet, PDF (281/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Peripheral Interface Module (SPI)
16.4 Pin Name Conventions and I/O Register Addresses
The text that follows describes the SPI. The SPI I/O pin names are SS
(slave select), SPSCK (SPI serial clock), CGND (clock ground), MOSI
(master out slave in), and MISO (master in/slave out). The SPI shares
four I/O pins with four parallel I/O ports.
The full names of the SPI I/O pins are shown in Table 16-1. The generic
pin names appear in the text that follows.
Table 16-1. Pin Name Conventions
SPI Generic
Pin Names:
MISO
MOSI
SS
SPSCK CGND
Full SPI
Pin Names:
SPI
PTE5/MISO
PTE6/MOSI
PTE4/SS
PTE7/SPSCK
V_SS
16.5 Functional Description
Figure 16-1 summarizes the SPI I/O registers and Figure 16-2 shows
the structure of the SPI module.
Addr.
$0010
$0011
$0012
Register Name
Read:
SPI Control Register
(SPCR)
Write:
Reset:
Read:
SPI Status and Control
Register (SPSCR)
Write:
Reset:
Read:
SPI Data Register
(SPDR)
Write:
Reset:
Bit 7
SPRIE
0
SPRF
0
R7
T7
6
5
R SPMSTR
0
ERRIE
1
OVRF
0
0
R6
R5
T6
T5
= Unimplemented
4
3
CPOL CPHA
0
MODF
1
SPTE
0
1
R4
R3
T4
T3
Unaffected by reset
R
2
1
SPWOM SPE
0
0
MODFEN SPR1
0
0
R2
R1
T2
T1
= Reserved
Figure 16-1. SPI I/O Register Summary
Bit 0
SPTIE
0
SPR0
0
R0
T0
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
Serial Peripheral Interface Module (SPI)
Technical Data
281