75
CHAPTER 3 INTERRUPTS
3.7.2
EI
2
OS Status Register (ISCS)
This 8-bit register indicates the update direction (increment/decrement), transfer data
format (byte/word), and transfer direction of the buffer address pointer and the I/O
register address pointer. This register also indicates whether the buffer address pointer
or I/O register address pointer is updated or fixed.
■
EI
2
OS Status Register (ISCS)
Figure 3.7-5 is a diagram of the ISCS configuration.
Figure 3.7-5 ISCS Configuration
Each bit is described below.
[bit4] IF: Specify whether the I/O register address pointer is updated or fixed.
0: The I/O register address pointer is updated after data transfer.
1: The I/O register address pointer is not updated after data transfer.
Note:
Only increment is allowed.
[bit3] BW: Specify the transfer data length.
0: Byte
1: Word
[bit2] BF: Specify whether the buffer address pointer is updated or fixed.
0: The buffer address pointer is updated after data transfer.
1: The buffer address pointer is not updated after data transfer.
Note:
Only the low-order 16 bits of the buffer address are updated. Only increment is allowed.
[bit1] DIR: Specify the data transfer direction.
0: I/O address pointer
→
Buffer address pointer
1: Buffer address pointer
→
I/O address pointer
BW
IF
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
ISCS
(Undefined
w
hen reset)
Note: Al
w
ays
w
rite "0" to bit7 to bit5 of ISCS.
bit
BF
DIR
SE
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
Страница 18: ...xiv ...
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 ...
Страница 722: ...694 APPENDIX ...
Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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