参数资料
型号: ATSTK500
厂商: Atmel
文件页数: 30/61页
文件大小: 0K
描述: PROGRAMMER AVR STARTER KIT
产品培训模块: MCU Product Line Introduction
标准包装: 1
系列: AVR®
类型: MCU
适用于相关产品: Atmel AVR 设备
所含物品: 板,线缆,CD 和文档
产品目录页面: 615 (CN2011-ZH PDF)
配用: ATADAPCAN01-ND - EXTENSION CAN ADD-ON TO STK500/1
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Hardware Description
When connected to an external system, there is often an external pull-up resistor con-
nected to the reset line. A typical reset connection is shown in Figure 3-27.
Figure 3-27. External Reset Connection
R (4.7 kohm)
RESET
C (10 nF)
If the external pull-up resistor is too low (<4.7 k ? ), STK500 will not be able to pull the
RESET line low.
3.8.4
3-20
Clock Settings,
XTAL1 and OSCSEL
STK500 includes several clock options for the target AVR. Setting the jumpers XTAL1
and OSCSEL controls the clock selections. OSCSEL determines what signal to route to
the XTAL1 pin of the AVR.
When the XTAL1 jumper is connected, the STK500 internal clock system is used as
main clock to the target AVR. When XTAL1 jumper is not mounted, the internal clock
system is disconnected. This allows external clock signals or crystals to be used as tar-
get clock source for the AVR. Figure 3-28 illustrates the XTAL1 jumper option.
Figure 3-28. XTAL1 Jumper Options
Jumper Mounted
AREF
RESET
XTAL1
OSCSEL
On-board XTAL1 Signal Connected (Default)
Jumper not Mounted
AREF
RESET
XTAL1
OSCSEL
On-board XTAL1 Signal Disconnected
When the XTAL1 jumper is not mounted, an external clock source or crystal can be con-
nected to the PORTE header. This is shown in Figure 3-30.
AVR STK500 User Guide
1925C–AVR–3/03
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