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參數(shù)資料
型號(hào): EVAL-ADUC832QSZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 60/92頁(yè)
文件大小: 0K
描述: KIT DEV FOR ADUC832 QUICK START
產(chǎn)品培訓(xùn)模塊: Process Control
標(biāo)準(zhǔn)包裝: 1
系列: QuickStart™ 套件
類型: MCU
適用于相關(guān)產(chǎn)品: ADuC832
所含物品: 評(píng)估板,線纜,電源,軟件和文檔
其它名稱: EVAL-ADUC832QS
EVAL-ADUC832QS-ND
Data Sheet
ADuC832
Rev. B | Page 63 of 92
POWER SUPPLY MONITOR
As its name suggests, the power supply monitor, once enabled,
monitors the DVDD supply on the ADuC832. It indicates when
any of the supply pins drop below one of four user-selectable
voltage trip points from 2.63 V to 4.37 V. For correct operation
of the power supply monitor function, AVDD must be equal to
or greater than 2.7 V. The monitor function is controlled via
the PSMCON SFR. If enabled via the IEIP2 SFR, the monitor
interrupts the core using the PSMI bit in the PSMCON SFR.
This bit is not cleared until the failing power supply has returned
above the trip point for at least 250 ms. This monitor function
allows the user to save working registers to avoid possible data
loss due to the low supply condition, and ensures that normal
code execution does not resume until a safe supply level has
been well established. The supply monitor is also protected
against spurious glitches triggering the interrupt circuit.
PSMCON (POWER SUPPLY MONITOR CONTROL
REGISTER )
SFR Address:
DFH
Power-On Default Value:
DEH
Bit Addressable :
No
Table 31. PSMCON SFR Bit Designations
Bit
Name
Description
[7]
Reserved
Reserved.
[6]
CMPD
DVDD comparator bit.
This is a read-only bit and directly reflects the state of the DVDD comparator.
Read 1 indicates the DVDD supply is above its selected trip point.
Read 0 indicates the DVDD supply is below its selected trip point.
[5]
PSMI
Power supply monitor interrupt bit.
This bit is set high by the MicroConverter if CMPD is low, indicating low analog or digital supply. The PSMI bit can be
used to interrupt the processor. Once CMPD returns (and remains) high, a 250 ms counter is started. When this counter
times out, the PSMI interrupt is cleared. PSMI can also be written by the user. However, if either comparator output is
low, it is not possible for the user to clear PSMI.
[4:3]
TPD[1:0]
DVDD trip point selection bits. These bits select the DVDD trip point voltage as follows:
TPD1
TPD0
Selected DVDD Trip Point (V)
0
4.37
0
1
3.08
1
0
2.93
1
2.63
[2]
Reserved
Reserved.
[1]
Reserved
Reserved.
[0]
PSMEN
Power supply monitor enable bit. Set to 1 by the user to enable the power supply monitor circuit. Cleared to 0 by the
user to disable the power supply monitor circuit.
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