参数资料
型号: PIC16LF72T-I/ML
厂商: Microchip Technology
文件页数: 133/136页
文件大小: 0K
描述: IC MCU FLASH 2KX14 LV AD 28-QFN
产品培训模块: Asynchronous Stimulus
标准包装: 1,600
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 5x8b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 28-VQFN 裸露焊盘
包装: 带卷 (TR)
96
2535J–AVR–08/10
ATtiny13
When designing a system where debugWIRE will be used, the following must be observed:
Pull-Up resistor on the dW/(RESET) line must be in the range of 10k to 20 k
Ω. However, the
pull-up resistor is optional.
Connecting the RESET pin directly to VCC will not work.
Capacitors inserted on the RESET pin must be disconnected when using debugWire.
All external reset sources must be disconnected.
15.4 Software Break Points
debugWIRE supports Program memory Break Points by the AVR Break instruction. Setting a
Break Point in AVR Studio will insert a BREAK instruction in the Program memory. The instruc-
tion replaced by the BREAK instruction will be stored. When program execution is continued, the
stored instruction will be executed before continuing from the Program memory. A break can be
inserted manually by putting the BREAK instruction in the program.
The Flash must be re-programmed each time a Break Point is changed. This is automatically
handled by AVR Studio through the debugWIRE interface. The use of Break Points will therefore
reduce the Flash Data retention. Devices used for debugging purposes should not be shipped to
end customers.
15.5 Limitations of debugWIRE
The debugWIRE communication pin (dW) is physically located on the same pin as External
Reset (RESET). An External Reset source is therefore not supported when the debugWIRE is
enabled.
The debugWIRE system accurately emulates all I/O functions when running at full speed, i.e.,
when the program in the CPU is running. When the CPU is stopped, care must be taken while
accessing some of the I/O Registers via the debugger (AVR Studio). See the debugWIRE docu-
mentation for detailed description of the limitations.
The debugWIRE interface is asynchronous, which means that the debugger needs to synchro-
nize to the system clock. If the system clock is changed by software (e.g. by writing CLKPS bits)
communication via debugWIRE may fail. Also, clock frequencies below 100 kHz may cause
communication problems.
A programmed DWEN fuse enables some parts of the clock system to be running in all sleep
modes. This will increase the power consumption while in sleep. Thus, the DWEN fuse should
be disabled when debugWire is not used.
15.6 Register Description
The following section describes the registers used with the debugWire.
15.6.1
DWDR –debugWire Data Register
The DWDR Register provides a communication channel from the running program in the MCU
to the debugger. This register is only accessible by the debugWIRE and can therefore not be
used as a general purpose register in the normal operations.
Bit
765
4321
0
DWDR[7:0]
DWDR
Read/Write
R/W
Initial Value
000
0000
0
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