參數(shù)資料
型號: P89LPC9381FDH
廠商: NXP Semiconductors N.V.
元件分類: 8位微控制器
英文描述: 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB 3 V byte-erasable flash with 10-bit ADC
封裝: P89LPC9381FDH<SOT361-1 (TSSOP28)|<<http://www.nxp.com/packages/SOT361-1.html<1<Always Pb-free,;
文件頁數(shù): 19/59頁
文件大小: 286K
代理商: P89LPC9381FDH
P89LPC9381_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 8 September 2006
26 of 60
Philips Semiconductors
P89LPC9381
8-bit microcontroller with 10-bit ADC
Timer 0 and Timer 1 have ve operating modes (modes 0, 1, 2, 3 and 6). Modes 0, 1, 2
and 6 are the same for both Timers/Counters. Mode 3 is different.
7.17.1 Mode 0
Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit
Counter with a divide-by-32 prescaler. In this mode, the Timer register is congured as a
13-bit register. Mode 0 operation is the same for Timer 0 and Timer 1.
7.17.2 Mode 1
Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used.
7.17.3 Mode 2
Mode 2 congures the Timer register as an 8-bit Counter with automatic reload. Mode 2
operation is the same for Timer 0 and Timer 1.
7.17.4 Mode 3
When Timer 1 is in Mode 3 it is stopped. Timer 0 in Mode 3 forms two separate 8-bit
counters and is provided for applications that require an extra 8-bit timer. When Timer 1 is
in Mode 3 it can still be used by the serial port as a baud rate generator.
7.17.5 Mode 6
In this mode, the corresponding timer can be changed to a PWM with a full period of
256 timer clocks.
7.17.6 Timer overow toggle output
Timers 0 and 1 can be congured to automatically toggle a port output whenever a timer
overow occurs. The same device pins that are used for the T0 and T1 count inputs are
also used for the timer toggle outputs. The port outputs will be a logic 1 prior to the rst
timer overow when this mode is turned on.
7.18 RTC/system timer
The P89LPC9381 has a simple RTC that allows a user to continue running an accurate
timer while the rest of the device is powered-down. The RTC can be a wake-up or an
interrupt source. The RTC is a 23-bit down counter comprised of a 7-bit prescaler and a
16-bit loadable down counter. When it reaches all ‘0’s, the counter will be reloaded again
and the RTCF ag will be set. The clock source for this counter can be either the CPU
clock (CCLK) or the XTAL oscillator, provided that the XTAL oscillator is not being used as
the CPU clock. If the XTAL oscillator is used as the CPU clock, then the RTC will use
CCLK as its clock source. Only power-on reset will reset the RTC and its associated SFRs
to the default state.
7.19 UART
The P89LPC9381 has an enhanced UART that is compatible with the conventional 80C51
UART except that Timer 2 overow cannot be used as a baud rate source. The
P89LPC9381 does include an independent Baud Rate Generator. The baud rate can be
selected from the oscillator (divided by a constant), Timer 1 overow, or the independent
Baud Rate Generator. In addition to the baud rate generation, enhancements over the
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