參數(shù)資料
型號： P89CV51RC2FBC,557
廠商： NXP Semiconductors
文件頁數(shù)： 28/76頁
文件大?。?/td> 0K
描述： IC 80C51 MCU FLASH 32K 44-TQFP
標準包裝： 800
系列： 89C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
連通性： EBI/EMI，SPI，UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： 閃存
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-TQFP
包裝： 托盤
其它名稱： 568-4255
935284104557
P89CV51RC2FBC
P89CV51RB2_RC2_RD2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 25 August 2009
34 of 76
NXP Semiconductors
P89CV51RB2/RC2/RD2
80C51 with 1 kB RAM, SPI
6.5.3 Programmable clock-out
A 50 % duty cycle clock can be programmed to come out on pin T2 (P1[0], Clock-out
mode). This pin, besides being a regular I/O pin, has two additional functions. It can be
programmed:
1. To input the external clock for timer/counter 2, or
2. To output a 50 % duty cycle clock ranging from 122 Hz to 8 MHz at a 16 MHz
operating frequency.
To congure the timer/counter 2 as a clock generator, bit C/T2 (in T2CON) must be
cleared and bit T2OE in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start
the timer.
The clock-out frequency depends on the oscillator frequency and the reload value of
Timer 2 capture registers (RCAP2H, RCAP2L) as shown in Equation 2:
(2)
Where (RCAP2H, RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
In the Clock-out mode, Timer 2 roll-overs will not generate an interrupt. This is similar to
when it is used as a baud rate generator.
6.5.4 Baud rate generator mode
Bits TCLK and/or RCLK in T2CON allow the UART transmit and receive baud rates to be
derived from either Timer 1 or Timer 2; see Section 6.6 for details. When TCLK = 0, Timer
1 is used as the UART transmit baud rate generator. When TCLK = 1, Timer 2 is used as
the UART transmit baud rate generator. RCLK has the same effect for the UART receive
baud rate. With these two bits, the serial port can have different receive and transmit baud
rates, Timer 1 or Timer 2.
Figure 14 shows Timer 2 in Baud rate generator mode:
OscillatorFrequency
2
65536
RCAP2H RCAP2L
,
()
–
()
×
------------------------------------------------------------------------------------------
Fig 14. Timer 2 in Baud rate generator mode
002aaa526
TX/RX baud rate
timer 2
interrupt
OSC
÷2
T2 pin
C/T2 = 0
C/T2 = 1
TL2
(8-bits)
TH2
(8-bits)
control
TR2
EXF2
RCAP2L RCAP2H
control
EXEN2
transition
detector
T2EX pin
reload
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P89CV51RD2FBC 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 64 kB flash microcontroller with 1 kB RAM, SPI, 6-clock CPU with 6/12-clock peripherals
P89CV51RD2FBC,557 功能描述:8位微控制器 -MCU 80C51 64K FL / 1K R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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