參數(shù)資料
型號: AT89LP52-20AU
廠商: Atmel
文件頁數(shù): 70/117頁
文件大小: 0K
描述: IC MCU 8051 8K FLASH SPI 44TQFP
標(biāo)準(zhǔn)包裝: 160
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: EBI/EMI,I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲(chǔ)器容量: 8KB(8K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 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
56
3709D–MICRO–12/11
AT89LP51/52
Figure 12-6. Timer 2 in Baud Rate Generator Mode
12.5
Frequency Generator (Programmable Clock Out)
Timer 2 can generate a 50% duty cycle clock on T2 (P1.0), as shown in Figure 13.. This pin,
besides being a regular I/O pin, has two alternate functions. It can be programmed to input the
external clock for Timer/Counter 2 or to toggle its output at every timer overflow. To configure
the Timer/Counter 2 as a clock generator, bit C/T2 (T2CON.1) must be cleared and bit T2OE
(T2MOD.1) must be set. Bit TR2 (T2CON.2) starts and stops the timer. The clock-out frequency
depends on the system frequency and the reload value of Timer 2 capture registers (RCAP2H,
RCAP2L), as shown in the following equation.
In the frequency generator mode, Timer 2 roll-overs will not generate an interrupt. This behavior
is similar to when Timer 2 is used as a baud-rate generator. It is possible to use Timer 2 as a
baud-rate generator and a clock generator simultaneously. Note, however, that the baud-rate
and clock-out frequencies cannot be determined independently from one another since they
both use RCAP2H and RCAP2L.
Figure 12-7. Timer 2 in Clock-out Mode
÷CDV
SMOD1
RCLK
TCLK
Rx
CLOCK
Tx
CLOCK
T2EX PIN
T2 PIN
TR2
"1"
"0"
TIMER 1 OVERFLOW
TIMER 2
INTERRUPT
2
16
RCAP2H
RCAP2L
TL2
TH2
C/T2 = 0
C/T2 = 1
EXF2
TRANSITION
DETECTOR
EXEN2
÷
OSC
Clock Out Frequency
System Frequency
2
65536
RCAP2H,RCAP2L
()
[]
×
--------------------------------------------------------------------------------------------
=
OSC
T2EX PIN
T2 PIN
TR2
TIMER 2
INTERRUPT
RCAP2H
RCAP2L
TL2
TH2
C/T2
EXF2
TRANSITION
DETECTOR
EXEN2
÷CDV
÷2
T2OE
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