参数资料
型号: PIC32MX575F256L-80I/BG
厂商: Microchip Technology
文件页数: 16/64页
文件大小: 0K
描述: IC MCU 32BIT 256KB FLASH 121XBGA
特色产品: 32-Bit PIC? Microcontroller
PIC32 32-Bit MCU Families
标准包装: 184
系列: PIC® 32MX
核心处理器: MIPS32? M4K?
芯体尺寸: 32-位
速度: 80MHz
连通性: CAN,I²C,SPI,UART/USART,USB OTG
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
程序存储器容量: 256KB(256K x 8)
程序存储器类型: 闪存
RAM 容量: 64K x 8
电压 - 电源 (Vcc/Vdd): 2.3 V ~ 3.6 V
数据转换器: A/D 16x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 121-TFBGA
包装: 托盘
产品目录页面: 650 (CN2011-ZH PDF)
2007-2012 Microchip Technology Inc.
DS61145K-page 23
PIC32MX
10.0
ENTERING SERIAL
EXECUTION MODE
Before a device can be programmed, it must be placed
in Serial Execution mode. The procedure for entering
Serial Execution mode consists of verifying that the
device is not code-protected. If the device is code-pro-
tected, a Chip Erase must be performed. See
FIGURE 10-1:
ENTERING SERIAL
EXECUTION MODE
10.1
4-wire Interface
The following steps are required to enter Serial
Execution mode:
1.
SendCommand
(MTAP_SW_MTAP).
2.
SendCommand
(MTAP_COMMAND).
3.
statusVal = XferData (MCHP_STATUS).
4.
If CPS (statusVal<7>) is not ‘1’, the device must
be erased first.
5.
SendCommand
(MTAP_SW_ETAP).
6.
SendCommand
(ETAP_EJTAGBOOT).
7.
Set MCLR high.
10.2
2-wire Interface
The following steps are required to enter Serial
Execution mode:
1.
SendCommand
(MTAP_SW_MTAP).
2.
SendCommand
(MTAP_COMMAND).
3.
statusVal = XferData (MCHP_STATUS).
4.
If CPS (statusVal<7>) is not ‘1’, the device must
be erased first.
5.
XferData (MCHP_ASSERT_RST).
6.
SendCommand
(MTAP_SW_ETAP).
7.
SendCommand
(ETAP_EJTAGBOOT).
8.
SendCommand
(MTAP_SW_MTAP).
9.
SendCommand
(MTAP_COMMAND).
10. XferData (MCHP_DE_ASSERT_RST).
11. XferData (MCHP_FLASH_ENABLE).
12. SendCommand (MTAP_SW_ETAP).
Select MTAP
SendCommand
(MTAP_SW_MTAP)
Put MTAP in Command Mode
SendCommand
(MTAP_COMMAND)
Read Code-Protect Status
statusVal = XferData (MCHP_STATUS)
CPS = 1
Cannot Enter
Must Erase First
Select ETAP
SendCommand
(MTAP_SW_ETAP)
Put CPU in Serial Exec Mode
SendCommand
(ETAP_EJTAGBOOT)
No
2-wire
4-wire
Set MCLR High
Enable Flash
XferData (MCHP_FLASH_EN)
Release Reset
XferData (MCHP_DE_ASSERT_RST)
Put MTAP in Command Mode
SendCommand
(MTAP_COMMAND)
Select MTAP
SendCommand
(MTAP_SW_MTAP)
Assert Reset
XferData (MCHP_ASSERT_RST)
2-wire
Yes
Select ETAP
SendCommand
(MCHP_SW_ETAP)
Note:
It is assumed that MCLR has been driven
low from the previous Check Device
Status step (see Figure 8-1).
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