
142
CHAPTER 7 INTERRUPT
7.6.2
Registers of EI
2
OS Descriptor (ISD)
• Data counter (DCT)
• I/O register address pointer (IOA)
• EI
2
OS status register (ISCS)
• Buffer address pointer (BAP)
Note: that the initial value of each register is undefined after a reset.
■
Data Counter (DCT)
The DCT is a 16-bit register that serves as a counter for the data transfer count. After each data transfer,
the counter is decremented by "1". When the counter reaches zero, EI
2
OS terminates.
Figure 7.6-3 shows the configuration of the DCT.
Figure 7.6-3 Configuration of DCT
■
I/O Register Address Pointer (IOA)
The IOA is a 16-bit register that indicates the lower address (A15 to A00) of the I/O register used to
transfer data to and from the buffer. The upper address (A23 to A16) is all zeros. Any I/O from 000000
H
to 00FFFF
H
can be specified by address. Figure 7.6-4 shows the configuration of the IOA.
Figure 7.6-4 Configuration of I/O Register Address Pointer (IOA)
B15
B14
B13
B12
B11
B10
B09
B08
15
14
13
12
11
10
9
8
DCTH
(X)
(X)
(X)
(X)
(X)
(X)
(X)
(X)
Initial value
Upper byte of data counter
B07
B06
B05
B04
B03
B02
B01
B00
7
6
5
4
3
2
1
0
DCTL
(X)
(X)
(X)
(X)
(X)
(X)
(X)
(X)
Initial value
Lower byte of data counter
bit
bit
A07
A06
A05
A04
A03
A02
A01
A00
7
6
5
4
3
2
1
0
IOAL
(X)
(X)
(X)
(X)
(X)
(X)
(X)
(X)
Initial value
Lower address pointer
A15
A14
A13
A12
A11
A10
A09
A08
15
14
13
12
11
10
9
8
IOAH
(X)
(X)
(X)
(X)
(X)
(X)
(X)
(X)
Initial value
Upper address pointer
bit
bit
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
Страница 3: ......
Страница 5: ......
Страница 9: ...iv ...
Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Страница 739: ......