P89LPC912FDH NXP Semiconductors, P89LPC912FDH Datasheet - Page 36

• Manufacturer Part Number: P89LPC912FDH
• Description: MCU 8BIT 80C51 1K FLASH, TSSOP14
• Manufacturer: NXP Semiconductors

Specifications of P89LPC912FDH

• Controller Family/series: (8051) 8052
• Core Size: 8bit
• No. Of I/o's: 12
• Program Memory Size: 1KB
• Ram Memory Size: 128Byte
• Cpu Speed: 18MHz
• Oscillator Type: External, Internal
• No. Of Timers: 4
• No. Of: RoHS Compliant

NXP Semiconductors
P89LPC912_913_914_5
Product data sheet
8.12.7 Additional port features
8.13.1 Brownout detection
8.13.2 Power-on detection
8.13 Power monitoring functions
8.14 Power reduction modes
After power-up, all pins are in Input-Only mode. After power-up all I/O pins except P1.5,
may be configured by software.
Every output on the P89LPC912/913/914 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
All port 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.
The P89LPC912/913/914 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.
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
brownout trip voltage, V
rises above V
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
Please see
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.
The P89LPC912/913/914 supports three different power reduction modes. These modes
are Idle mode, Power-down mode, and Total Power-down mode.
•
•
Pin P1.5 is input only.
P1.2/T0 is configurable for either input-only or open-drain (P89LPC912, P89LPC914).
Table 13 “Static characteristics”
bo
. If the P89LPC912/913/914 device is to operate with a power supply that
Rev. 05 — 28 September 2007
bo
(see
Table 13 “Static characteristics”
Table 13 “Static
8-bit microcontrollers with two-clock 80C51 core
for specifications.
characteristics”), and is negated when V
DD
P89LPC912/913/914
rise and fall times must be observed.
for detailed specifications.
© NXP B.V. 2007. All rights reserved.
DD
falls below the
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DD