440
CHAPTER 22 SERIAL I/O
22.2.1
Serial Mode Control Status Register (SMCS)
The serial mode control status register (SMCS) controls the serial I/O transfer mode.
■
Upper Byte of Serial Mode Control Status Register (SMCS)
Figure 22.2-1 Configuration of the Serial Mode Control Status Register (Upper Byte)
SIE
Serial I/O Interrupt Enable bit
0
Serial I/O interrupt disabled
1
Serial I/O interrupt enabled
SIR
Serial I/O Interrupt Request bit
0
No interrupt is requested
1
If SIE = 1, an interrupt request is issued to CPU
BUSY
Transfer Status bit
0
Transfer is stopped or standing by for serial data
register Read/Write
1
Serial transfer is active
STOP
Stop bit
0
Normal operation
1
Transfer stopped
SMD2
SMD1
SMD0
SIE
SIR
BUSY
STOP
STRT
Initial value
00000010
B
Address
00002D
H
bit14
bit15
bit13
bit12
bit11
bit10
bit9
bit8
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
STRT
Start bit
0
Writing "0" has no effect. "0" is al
w
ays read
1
Writing "1" activates serial transfer, if MODE = 0
R :
Read only
R/W :
Readable and
w
ritable
: Initial value
SMD2 to
SMD0
Shift Clock Mode selection bits
000
B
Prescaler output clock is divided by 2
001
B
Prescaler output clock is divided by 4
010
B
Prescaler output clock is divided by 16
011
B
Prescaler output clock is divided by 32
100
B
Prescaler output clock is divided by 64
101
B
External shift clock mode
110
B
Prescaler output clock is divided by 8
111
B
Prescaler output clock is divided by 128
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
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Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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