2 power-on detection, 3 power reduction modes, Ip point – NXP Semiconductors P89LPC9321 UM10310 User Manual
Page 34: Table 15, Gives, Table 16, Nxp semiconductors
UM10310
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User manual
Rev. 2 — 1 November 2010
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NXP Semiconductors
UM10310
P89LPC9321 User manual
For correct activation of Brownout Detect, certain V
DD
rise and fall times must be
observed. Please see the data sheet for specifications.
5.2 Power-on
detection
The Power-On Detect has a function similar to the Brownout Detect, but is designed to
work as power initially comes up, before the power supply voltage reaches a level where
the Brownout Detect can function. The POF flag (RSTSRC.4) is set to indicate an initial
power-on condition. The POF flag will remain set until cleared by software by writing a
logic 0 to the bit. BOF (RSTSRC.5) will be set when POF is set.
5.3 Power
reduction
modes
The P89LPC9321 supports three different power reduction modes as determined by SFR
bits PCON[1:0] (see
Table 15.
BOD Trip points configuration
BOE1
(UCFG1.5)
BOE0
(UCFG1.3)
BOICFG1
(BOICFG.1)
BOICFG0
(BOICFG.0)
BOD Reset
BOD
Interrupt
0
0
0
0
Reserved
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
2.2V
2.4V
0
1
1
0
2.2V
2.6V
0
1
1
1
2.2V
3.2V
1
0
0
0
Reserved
1
0
0
1
1
0
1
0
2.4V
2.6V
1
0
1
1
2.4V
3.2V
1
1
0
0
Reserved
1
1
0
1
1
1
1
0
1
1
1
1
3.0V
3.2V
Table 16.
BOD Reset and BOD Interrupt configuration
PMOD1/PMOD0(PCON[1:0])
BOI
(PCON.4)
EBO
(IEN0.5)
EA
(IEN0.7)
BOD
Reset
BOD
Interrupt
11 (total power-down)
X
X
X
N
N
≠ 11 (any mode other than total
power down)
0
X
X
Y
N
1
0
X
Y
N
X
0
Y
N
1
1
Y
Y