參數(shù)資料
型號(hào): MC68HCP11E1VFNE2
廠商: Freescale Semiconductor
文件頁數(shù): 119/242頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 52-PLCC
標(biāo)準(zhǔn)包裝: 23
系列: HC11
核心處理器: HC11
芯體尺寸: 8-位
速度: 2MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 38
程序存儲(chǔ)器類型: ROMless
EEPROM 大?。?/td> 512 x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 52-LCC(J 形引線)
包裝: 管件
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁當(dāng)前第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁
Driving Boot Mode from Another M68HC11
M68HC11 Bootstrap Mode, Rev. 1.1
Freescale Semiconductor
205
Driving Boot Mode from Another M68HC11
A second M68HC11 system can easily act as the host to drive bootstrap loading of an M68HC11 MCU.
This method is used to examine and program non-volatile memories in target M68HC11s in Freescale
EVMs. The following hardware and software example will demonstrate this and other bootstrap mode
features.
The schematic in Figure 6 shows the circuitry for a simple EPROM duplicator for the MC68HC711E9. The
circuitry is built in the wire-wrap area of an M68HC11EVBU evaluation board to simplify construction. The
schematic shows only the important portions of the EVBU circuitry to avoid confusion. To see the
complete EVBU schematic, refer to the M68HC11EVBU Universal Evaluation Board User’s Manual,
Freescale document order number M68HC11EVBU/D.
The default configuration of the EVBU must be changed to make the appropriate connections to the
circuitry in the wire-wrap area and to configure the master MCU for bootstrap mode. A fabricated jumper
must be installed at J6 to connect the XTAL output of the master MCU to the wire-wrap connector P5,
which has been wired to the EXTAL input of the target MCU. Cut traces that short across J8 and J9 must
be cut on the solder side of the printed circuit board to disconnect the normal SCI connections to the
RS232 level translator (U4) of the EVBU. The J8 and J9 connections can be restored easily at a later time
by installing fabricated jumpers on the component side of the board. A fabricated jumper must be installed
across J3 to configure the master MCU for bootstrap mode.
One MC68HC711E9 is first programmed by other means with a desired 12-Kbyte program in its EPROM
and a small duplicator program in its EEPROM. Alternately, the ROM program in an MC68HC11E9 can
be copied into the EPROM of a target MC68HC711E9 by programming only the duplicator program into
the EEPROM of the master MC68HC11E9. The master MCU is installed in the EVBU at socket U3. A
blank MC68HC711E9 to be programmed is placed in the socket in the wire-wrap area of the EVBU (U6).
With the VPP power switch off, power is applied to the EVBU system. As power is applied to the EVBU,
the master MCU (U3) comes out of reset in bootstrap mode. Target MCU (U6) is held in reset by the PB7
output of master MCU (U3). The PB7 output of U3 is forced to 0 when U3 is reset. The master MCU will
later release the reset signal to the target MCU under software control. The RxD and TxD pins of the target
MCU (U6) are high-impedance inputs while U6 is in reset so they will not affect the TxD and RxD signals
of the master MCU (U3) while U3 is coming out of reset. Since the target MCU is being held in reset with
MODA and MODB at 0, it is configured for the PROG EPROM emulation mode, and PB7 is the output
enable signal for the EPROM data I/O (input/output) pins. Pullup resistor R7 causes the port D pins,
including RxD and TxD, to remain in the high-impedance state so they do not interfere with the RxD and
TxD pins of the master MCU as it comes out of reset.
As U3 leaves reset, its mode pins select bootstrap mode so the bootloader firmware begins executing. A
break is sent out the TxD pin of U3. Pullup resistor R10 and resistor R9 cause the break character to be
seen at the RxD pin of U3. The bootloader performs a jump to the start of EEPROM in the master MCU
(U3) and starts executing the duplicator program. This sequence demonstrates how to use bootstrap
mode to pass control to the start of EEPROM after reset.
The complete listing for the duplicator program in the EEPROM of the master MCU is provided in
相關(guān)PDF資料
PDF描述
1828073-2 ADPT ASSY, FLANGED, YELLOW
MC68HCP11E1CFNE2 IC MCU 8BIT 52-PLCC
1828073-1 ADPT ASSY, FLANGED, RED
MC68711D3CFBE2 IC MCU 8BIT 44-QFP
VE-B11-CU-F4 CONVERTER MOD DC/DC 12V 200W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HLC908JK3CP 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HLC908QT1CFQ 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HLC908QT4CDW 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HLC908QT4CFQ 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HLC908QY1CDW 制造商:Rochester Electronics LLC 功能描述:LOW V-1.5K FLASH W/O ADC - Bulk