MC68HC11E1 MOTOROLA [Motorola, Inc], MC68HC11E1 Datasheet - Page 47

• Manufacturer Part Number: MC68HC11E1
• Description: M68HC11E Series Programming Reference Guide
• Manufacturer: MOTOROLA [Motorola, Inc]

Serial Peripheral Interface Data Register (SPDR)
MOTOROLA
SPR1 SPR0
0
0
1
1
(CPHA = 0)
(CPHA = 1)
1. SS ASSERTED
2. MASTER WRITES TO SPDR
3. FIRST SCK EDGE
4. SPIF SET
5. SS NEGATED
SAMPLE INPUT
SAMPLE INPUT
0
1
0
1
SCK (CPOL = 0)
SCK (CPOL = 1)
SS (TO SLAVE)
SCK CYCLE #
DATA OUT
DATA OUT
E Clock By
Divide
16
32
2
4
Figure 7. Serial Peripheral Interface Transfer Format
1
Address: $102A
SPI is double buffered in, single buffered out.
2
MSB
E = 1 MHz (Baud)
Read:
Write:
3
M68HC11E Series Programming Reference Guide
Frequency at
MSB
62.5 kHz
31.3 kHz
500 kHz
250 kHz
1
BIT 7
Bit 7
6
2
6
SLAVE CPHA = 1 TRANSFER IN PROGRESS
SLAVE CPHA = 0 TRANSFER IN PROGRESS
5
MASTER TRANSFER IN PROGRESS
6
6
E = 2 MHz (Baud)
3
5
Frequency at
4
62.5 kHz
1.0 MHz
500 kHz
125 kHz
4
5
5
4
3
5
3
4
4
2
E = 3 MHz (Baud)
Frequency at
6
187.5 kHz
2
93.8 kHz
1.5 MHz
750 kHz
3
3
1
7
1
LSB
2
2
M68HC11E Series Registers
8
E = 4 MHz (Baud)
LSB
4
Frequency at
M68HC11ERG/AD
1
1
250 kHz
125 kHz
2 MHz
1 MHz
5
BIT 0
Bit 0
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