2009 Microchip Technology Inc.
DS40044G-page 115
PIC16F627A/628A/648A
14.13 In-Circuit Debugger
Since in-circuit debugging requires the loss of clock,
data and MCLR pins, MPLAB ICD 2 development with
an 18-pin device is not practical. A special 28-pin
PIC16F648A-ICD device is used with MPLAB ICD 2 to
provide separate clock, data and MCLR pins and frees
all normally available pins to the user. Debugging of all
three versions of the PIC16F627A/628A/648A is
supported by the PIC16F648A-ICD.
This special ICD device is mounted on the top of a
header and its signals are routed to the MPLAB ICD 2
connector. On the bottom of the header is an 18-pin
socket that plugs into the user’s target via an 18-pin
stand-off connector.
When the ICD pin on the PIC16F648A-ICD device is
held low, the In-Circuit Debugger functionality is
enabled. This function allows simple debugging
functions when used with MPLAB ICD 2. When the
microcontroller has this feature enabled, some of the
resources are not available for general use. Table 14-19
shows which features are consumed by the background
debugger.
TABLE 14-19: DEBUGGER RESOURCES
The PIC16F648A-ICD device with header is supplied
as an assembly. See Microchip Part Number
AC162053.
I/O pins
ICDCLK, ICDDATA
Stack
1 level
Program Memory
Address 0h must be NOP
300h-3FEh
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PIC16F627AT-E/SS 功能描述:8位微控制器 -MCU 1.75KB 224 RAM 16I/O Ext Temp SSOP20 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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