538
CHAPTER 25 SOUND GENERATOR
■
Sound Generator Control Register (Upper)
Figure 25.2-3 Configuration of the Sound Generator Control Register (Upper Byte)
■
Sound Generator Control Register (SGCR) (Upper) Contents
bit 8
DEC
Auto-decrement enable bit
0
Auto-decrement disabled
1
Auto-decrement enabled
bit 9
BUSY
Nusy bit
0
Operation completed
1
Generator is busy
bit 15
Reserved
Reserved bit
0
al
w
ays
w
rite "0" to this bit
1
R/W
:
Readable and
w
ritable
R
:
Read only
-
:
Undefined
:
Initial value
Initial value
0 X X X X X 0 0
B
SGCR (upper)
R/W
R R/W
H
00005F
15
bit
14
13
12
11
10
9
8
Reserved
-
-
-
-
BUSY DEC
-
- - - - -
Table 25.2-2 Function of Each Bit of the Sound Generator Control Register (Upper)
Bit name
Function
bit15
Reserved bit
This is a reserved bit. Always write "0" to this bit.
bit14 to
bit10
Undefined
−
bit9
BUSY:
Busy bit
This bit indicates whether the Sound Generator is in operation. This bit is set to "1"
upon the ST bit is set to "1". It is reset to "0" when the ST bit is reset to "0" and the
operation is completed at the end of one tone cycle. Any write instructions performed
on this bit has no effect.
bit8
DEC:
Auto-decrement
enable bit
The DEC bit is prepared for an automatic de-gradation of the sound in conjunction
with the Decrement Grade register.
If this bit is set to "1", the stored value in the Amplitude Data register is decremented
by 1(one), every time when the Decrement counter counts the number of tone pulses
from the toggle flip-flop specified by the Decrement Grade register.
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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