XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 219

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

14.3.5.3 SPI Baud Rate Register
M68HC12B Family — Rev. 8.0
MOTOROLA
#1
#2
#3
#4
1. The serial pin control 0 bit enables bidirectional configurations.
2. Slave output is enabled if DDS4 = 1, SS = 0, and MSTR = 0. (#1, #3)
3. Master output is enabled if DDS5 = 1 and MSTR = 1. (#2, #4)
4. SCK output is enabled if DDS6 = 1 and MSTR = 1. (#2, #4)
5. SS output is enabled if DDS7 = 1, SSOE = 1, and MSTR = 1. (#2, #4)
Pin Mode
Bidirectional
Normal
Read: Anytime
Write: Anytime
At reset, E clock divided by 2 is selected.
SPR2–SPR0 — SPI Clock (SCK) Rate Select Bits
SPC0
These bits are used to specify the SPI clock rate.
Address:
0
1
SPR2
Reset:
Read:
Write:
(1)
0
0
0
0
1
1
1
1
MSTR
$00D2
Bit 7
SPR1
0
1
0
1
Table 14-4. Serial Pin Control
0
0
Figure 14-17. SPI Baud Rate Register (SP0BR)
0
0
1
1
0
0
1
1
= Unimplemented
General-purposeI/O
SPR0
Table 14-5. SPI Clock Rate Selection
0
1
0
1
0
1
0
1
6
0
0
Serial Interface
Slave out
Master in
Slave I/O
MISO
(2)
E Clock
Divisor
5
0
0
128
256
16
32
64
2
4
8
General-purposeI/O
4
0
0
E Clock = 4 MHz
Frequency at
Master out
Master I/O
MOSI
Slave in
62.5 kHz
31.3 kHz
15.6 kHz
2.0 MHz
1.0 MHz
500 kHz
250 kHz
125 kHz
3
0
0
(3)
Serial Peripheral Interface (SPI)
SPR2
2
0
SCK out
SCK out
SCK
SCK in
SCK in
E Clock = 8 MHz
Frequency at
62.5 kHz
31.3 kHz
4.0 MHz
2.0 MHz
1.0 MHz
500 kHz
250 kHz
125 kHz
(4)
SPR1
Serial Interface
1
0
SS I/O
SS I/O
SS
SS in
SS in
Data Sheet
(5)
SPR0
Bit 0
0
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