參數(shù)資料
型號: AT89LP52-20PU
廠商: Atmel
文件頁數(shù): 40/117頁
文件大小: 0K
描述: IC MCU 8051 8K FLASH SPI 40PDIP
標(biāo)準(zhǔn)包裝: 10
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
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 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: 40-DIP(0.600",15.24mm)
包裝: 管件
29
3709D–MICRO–12/11
AT89LP51/52
6.
System Clock
The system clock is generated directly from one of three selectable clock sources. The three
sources are the on-chip crystal oscillator, external clock source, and internal RC oscillator. A dia-
gram of the clock subsystem is shown in Figure 6-1. The on-chip crystal oscillator may also be
configured for low or high power operation. The clock source is selected by the Clock Source
User Fuses as shown in Table 6-1. See “User Configuration Fuses” on page 86. By default, in
Fast mode no internal clock division is used to generate the CPU clock from the system clock. In
Compatibility mode the default is to divide the oscillator output by two. The system clock divider
may be used to prescale the system clock with other values. The choice of clock source also
affects the start-up time after a POR, BOD or Power-down event (See “Reset” on page 32 or
Figure 6-1.
Clock Subsystem Diagram
6.1
Crystal Oscillator
When enabled, the internal inverting oscillator amplifier is connected between XTAL1 and
XTAL2 for connection to an external quartz crystal or ceramic resonator. The oscillator may
operate in either high-power or low-power mode. Low-speed mode is intended for crystals of 12
MHz or less and consumes less power than the higher speed mode. The configuration as shown
in Figure 6-2 applies for both high and low power oscillators. Note that in some cases, external
capacitors C1 and C2 may NOT be required due to the on-chip capacitance of the XTAL1 and
XTAL2 inputs (approximately 10 pF each). When using the crystal oscillator, P4.6 and P4.7 will
have their inputs and outputs disabled. Also, XTAL2 in crystal oscillator mode should not be
used to directly drive a board-level clock without a buffer.
Table 6-1.
Clock Source Settings
Clock Source
Fuse 1
Clock Source
Fuse 0
Selected Clock Source
1
High Power Crystal Oscillator (f > 12 MHz)
1
0
Low Power Crystal Oscillator (f
≤12 MHz)
01
External Clock on XTAL1
0
Internal 1.8432 MHz Auxiliary Oscillator
CLK
osc
XTAL1
XTAL2
SYSTEM CLOCK
(CLKSYS)
INTERNAL
1.8432MHz
OSC
0
1
2
3
CLK
osc
/2
CLK
osc
/4
CLK
osc
/8
CLK
osc
/1
6
CLK
osc
/3
2
5-BIT
CLOCK
DIVIDER
CLKIRC
CLKEXT
CLKXTAL
0
12345
CDV2-0
CLOCK FUSES
4-BIT
PRESCALER
TPS3-0
Timer 0
Timer 1
Timer 2
Watchdog
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