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參數(shù)資料
| 型號(hào)： | ST90158M9Q6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁(yè)數(shù)： | 83/199頁(yè) |
| 文件大?。?/td> | 3266K |
| 代理商： | ST90158M9Q6 |
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ST90158 - EIGHT-CHANNEL ANALOG TO DIGITAL CONVERTER (A/D)
ANALOG TO DIGITAL CONVERTER (Cont’d)
Figure 89. Application Example: Analog Watchdog used in Motorspeed Control
n
9.8.3 Interrupts
The A/D provides two interrupt sources:
– End of Conversion
– Analog Watchdog Request
The A/D Interrupt Vector Register (AD_IVR) pro-
vides hardware generated flags which indicate the
interrupt source, thus allowing automatic selection
of the correct interrupt service routine.
The A/D Interrupt vector should be programmed
by the User to point to the first memory location in
the Interrupt Vector table containing the base ad-
dress of the four byte area of the interrupt vector
table in which the address of the A/D interrupt
service routines are stored.
The Analog Watchdog Interrupt Pending bit (AWD,
AD_ICR.6), is automatically set by hardware
whenever any of the two guarded analog inputs go
out of range. The Compare Result Register (CRR)
tracks the analog inputs which exceed their pro-
grammed thresholds.
When two requests occur simultaneously, the An-
alog Watchdog Request has priority over the End
of Conversion request, which is held pending.
The Analog Watchdog Request requires the user
to poll the Compare Result Register (CRR) to de-
termine which of the four thresholds has been ex-
ceeded. The threshold status bits are set to flag an
out of range condition, and are automatically reset
by hardware after a software reset of the Analog
Watchdog Request flag in the AD_ICR Register.
The interrupt pending flags, ECV and AWD,
should be reset by the user within the interrupt
service routine. Setting either of these two bits by
software will cause an interrupt request to be gen-
erated.
9.8.3.1 Register Mapping
It is possible to have two independent A/D convert-
ers in the same device. In this case they are
named A/D 0 and A/D 1. If the device has one A/D
converter it uses the register addresses of A/D 0.
The register pages are the following:
Analog
Watch-
dog Re-
quest
70
Lower
Word
Address
XXX
XX
X
0
End of
Conv.
Request
70
Upper
Word
Address
XXX
XX
X
1
0
A/Dn
Register Page
A/D 0
63
A/D 1
61
9
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相關(guān)代理商/技術(shù)參數(shù) |
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| ST90158M9T1 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM |
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