MC912DG128A Motorola, MC912DG128A Datasheet - Page 242

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

SP0CR2 — SPI Control Register 2
Multiple Serial Interface
MC68HC912DT128A Rev 2.0
242
RESET:
Bit 7
0
0
6
0
0
Read or write anytime.
PUPS — Pull-Up Port S Enable
RDPS — Reduce Drive of Port S
SSWAI — Serial Interface Stop in WAIT mode
SPC0 — Serial Pin Control 0
#1
#2
#3
#4
1. The serial pin control 0 bit enables bidirectional configurations.
2. Slave output is enabled if DDRS4 = 1, SS = 0 and MSTR = 0. (#1, #3)
3. Master output is enabled if DDRS5 = 1 and MSTR = 1. (#2, #4)
4. SCK output is enabled if DDRS6 = 1 and MSTR = 1. (#2, #4)
5. SS output is enabled if DDRS7 = 1, SSOE = 1 and MSTR = 1. (#2, #4)
This bit decides serial pin configurations with MSTR control bit.
Pin Mode
Bidirectional
0 = No internal pull-ups on port S
1 = All port S input pins have an active pull-up device. If a pin is
0 = Port S output drivers operate normally
1 = All port S output pins have reduced drive capability for lower
0 = Serial interface clock operates normally
1 = Halt serial interface clock generation in WAIT mode
Normal
5
0
0
programmed as output, the pull-up device becomes inactive
power and less noise
Multiple Serial Interface
SPC0
4
0
0
0
1
(1)
MSTR
PUPS
0
1
0
1
3
1
Slave Out
Master In
Slave I/O
MISO
GPI/O
RDPS
2
0
(2)
Master I/O SCK Out
MOSI
Slave In
Master
GPI/O
SSWAI
Out
1
0
(3)
SCK Out
SCK
SCK In
SCK In
SPC0
Bit 0
0
(4)
MOTOROLA
SS I/O
SS I/O
SS In
SS In
SS
$00D1
20-msi
(5)