参数资料
型号: P89V660FA,512
厂商: NXP Semiconductors
文件页数: 41/90页
文件大小: 0K
描述: IC 80C51 MCU FLASH 16K 44-PLCC
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 1,300
系列: 89V
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 36
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
产品目录页面: 706 (CN2011-ZH PDF)
配用: 622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP
其它名称: 568-2432-5
935280828512
P89V660FA
P89V660_662_664
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3.1 — 17 October 2011
46 of 90
NXP Semiconductors
P89V660/662/664
80C51 with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI
In Figure 20, DCEN = 1 and Timer 2 is enabled to count up or down. This mode allows pin
T2EX to control the direction of count. When a logic ‘1’ is applied at pin T2EX Timer 2 will
count up. Timer 2 will overflow at 0FFFFH and set the TF2 flag, which can then generate
an interrupt, if the interrupt is enabled. This timer overflow also causes the 16-bit value in
RCAP2L and RCAP2H to be reloaded into the timer registers TL2 and TH2.
When a logic 0 is applied at pin T2EX this causes Timer 2 to count down. The timer will
underflow when TL2 and TH2 become equal to the value stored in RCAP2L and
RCAP2H. Timer 2 underflow sets the TF2 flag and causes 0FFFFH to be reloaded into the
timer registers TL2 and TH2. The external flag EXF2 toggles when Timer 2 underflows or
overflows. This EXF2 bit can be used as a 17th bit of resolution if needed.
6.6.3 Programmable clock-out
A 50 % duty cycle clock can be programmed to come out on pin T2 (P1[0]). 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 configure the Timer/Counter 2 as a clock generator, bit C/T2 (in T2CON) must be
cleared and bit T20E 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 n = 2 (6-clock mode) and n = 4 (12-clock mode);
Where (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
Fig 20. Timer 2 in Auto Reload mode (DCEN = 1)
002aaa525
TL2
(8-bits)
TH2
(8-bits)
TF2
EXF2
underflow
timer 2
interrupt
RCAP2L RCAP2H
FFH
overflow
(down-counting reload value)
(up-counting reload value)
count direction
1 = up
0 = down
T2EX pin
toggle
OSC
÷6
T2 pin
C/T2 = 0
C/T2 = 1
control
TR2
OscillatorFrequency
n
65536
RCAP2H RCAP2L
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