參數(shù)資料
型號(hào): MC68HC08KX8P
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP16
封裝: PLASTIC, DIP-16
文件頁數(shù): 86/210頁
文件大小: 1346K
代理商: MC68HC08KX8P
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頁當(dāng)前第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
Development Support
MC68HC908KX8 MC68HC908KX2 MC68HC08KX8 Data Sheet, Rev. 2.1
176
Freescale Semiconductor
NOTE
PTA1 = 0 and PTA0 = 1 allow normal serial communications. PTA1 = 1
allows parallel communications during security code entry. (For parallel
communications, configure PTA0 = 0 or PTA0 = 1.)
The MCU initially comes out of reset using the external clock for its clock source. This overrides the user
mode operation of the oscillator circuits where the part comes up using the internally generated oscillator.
Running from an external clock allows the MCU, using an appropriate frequency clock source, to
communicate with host software at standard baud rates.
NOTE
While the voltage on IRQ1 is at VTST, the ICG module is bypassed and the
external square-wave clock becomes the clock source. Dropping IRQ1 to
below VTST will remove the bypass and the MCU will revert to the clock
source selected by the ICG (as determined by the settings in the ICG
registers).
In normal monitor mode with VTST on IRQ1, the MCU alters
PTB7/(OSC2)/RST to function as a RST pin. This is useful for testing the
MCU. Dropping IRQ1 voltage to below VTST will revert PTB7/(OSC2)/RST
to its user mode function.
The computer operating properly (COP) module is disabled in normal monitor mode whenever VTST is
applied to the IRQ1 pin. If the voltage on IRQ1 is less than VTST, the COP module is controlled by the
COPD configuration bit.
16.3.1.3 Forced Monitor Mode
If the voltage applied to the IRQ1 is less than VTST, the MCU will come out of reset in user mode. The
MENRST module is monitoring the reset vector fetches and will assert an internal reset if it detects that
the reset vectors are erased ($FF). When the MCU comes out of reset, it is forced into monitor mode
without requiring high voltage on the IRQ1 pin.
Once out of reset, the monitor code is initially executing off the internal clock at its default frequency. The
monitor code reconfigures the ICG module to use the external square-wave clock source. Switching to an
external clock source allows the MCU, using an appropriate clock frequency, to communicate with host
software at standard baud rates.
The COP module is disabled in forced monitor mode. Any reset other than a power-on reset (POR) will
automatically force the MCU to come back to the forced monitor mode.
16.3.1.4 Monitor Mode Vectors
Monitor mode uses alternate vectors for reset and SWI interrupts. The alternate vectors are in the $FE
page instead of the $FF page and allow code execution from the internal monitor firmware instead of user
code. Table 16-2 shows vector differences between user mode and monitor mode.
Table 16-2. Monitor Mode Vector Relocation
Modes
Reset Vector High
Reset Vector Low
SWI Vector High
SWI Vector Low
User
$FFFE
$FFFF
$FFFC
$FFFD
Monitor
$FEFE
$FEFF
$FEFC
$FEFD
相關(guān)PDF資料
PDF描述
MC68HC908KX8VP 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP16
MC68HC908KX8CDW 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
MC68HC908LK24CFQ 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80
MC68HC908LK24CFU 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
MC68HC908LK24CPK 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC08LJ12 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Addendum to MC68HC908LJ12 Technical Data
MC68HC08LJ12CFB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Addendum to MC68HC908LJ12 Technical Data
MC68HC08LJ12CFU 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Addendum to MC68HC908LJ12 Technical Data
MC68HC08LJ12CPB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:low-voltage version of the MC68HC908LJ12
MC68HC08LN56 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification