參數(shù)資料
型號(hào)： P89LPC930
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontrollers with two-clock 80C51 core 4 kB/8 kB 3 V Flash with 256-byte data RAM
中文描述： 8位微控制器兩個(gè)小時(shí)80C51的核心4 KB的/ 8 KB的256 3伏閃存內(nèi)存字節(jié)的數(shù)據(jù)
文件頁(yè)數(shù)： 24/55頁(yè)
文件大?。?/td> 267K
代理商： P89LPC930
Philips Semiconductors
P89LPC930/931
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 05 — 15 December 2004
24 of 55
9397 750 14472
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.11.7
Additional port features
After power-up, all pins are in Input-Only mode.
Please note that this is different
from the LPC76x series of devices.
After power-up, all I/O pins except P1.5, may be configured by software.
Pin P1.5 is input only. Pins P1.2 and P1.3 and are configurable for either input-only
or open-drain.
Every output on the P89LPC930/931 has been designed to sink typical LED drive
current. However, there is a maximum total output current for all ports which must not
be exceeded. Please refer to
Table 7 “DC electrical characteristics”
for detailed
specifications.
All ports pins that can function as an output have slew rate controlled outputs to limit
noise generated by quickly switching output signals. The slew rate is factory-set to
approximately 10 ns rise and fall times.
8.12 Power monitoring functions
The P89LPC930/931 incorporates power monitoring functions designed to prevent
incorrect operation during initial power-up and power loss or reduction during
operation. This is accomplished with two hardware functions: Power-on Detect and
Brownout detect.
8.12.1
Brownout detection
The Brownout detect function determines if the power supply voltage drops below a
certain level. The default operation is for a Brownout detection to cause a processor
reset, however it may alternatively be configured to generate an interrupt.
Brownout detection may be enabled or disabled in software.
If Brownout detection is enabled, the brownout condition occurs when V
DD
falls below
the brownout trip voltage, V
BO
(see
Table 7 “DC electrical characteristics”
), and is
negated when V
DD
rises above V
BO
. If the P89LPC930/931 device is to operate with
a power supply that can be below 2.7 V, BOE should be left in the unprogrammed
state so that the device can operate at 2.4 V, otherwise continuous brownout reset
may prevent the device from operating.
For correct activation of Brownout detect, the V
DD
rise and fall times must be
observed. Please see
Table 7 “DC electrical characteristics”
for specifications.
8.12.2
Power-on detection
The Power-on Detect has a function similar to the Brownout detect, but is designed to
work as power comes up initially, before the power supply voltage reaches a level
where Brownout detect can work. The POF flag in the RSTSRC register is set to
indicate an initial power-up condition. The POF flag will remain set until cleared by
software.
8.13 Power reduction modes
The P89LPC930/931 supports three different power reduction modes. These modes
are Idle mode, Power-down mode, and total Power-down mode.
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