參數資料
型號: MC9S12A128
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: 16 bit Microcontroller Unit (MCU)(16位MCU)
中文描述: 16位微控制器單元(MCU)(16位微控制器)
文件頁數: 22/138頁
文件大?。?/td> 2093K
代理商: MC9S12A128
MC9S12DT128 Device User Guide — V02.11
22
Port K
Port K pull-up resistors are enabled out of reset, i.e. Bit 7 = PUKE = 1 in the register PUCR at
Base+$000C. Therefore care must be taken not to clear this bit.
Port M[7:6]
PM7:6 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
Port P6
PP6 must be configured as output or its pull resistor must be enabled to avoid a floating input.
Port S[7:4]
PS7:4 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
PAD[15:8] (ATD1 channels)
OutofresettheATD1isdisabledpreventingcurrentflowsinthepins.DonotmodifytheATD1
registers!
Pins not available in 80 pin QFP package for
MC9S12DB128 and SC515846
Port H
In order to avoid floating nodes the ports should be either configured as outputs by setting the
data direction register (DDRH at Base+$0262) to $FF, or enabling the pull resistors by writing
a $FF to the pull enable register (PERH at Base+$0264).
Port J[7:6, 1:0]
PortJpull-upresistorsareenabledoutofresetonallfourpins(7:6and1:0).Thereforecaremust
be taken not to disable the pull enables on PJ[7:6, 1:0] by clearing the bits PERJ7, PERJ6,
PERJ1 and PERJ0 at Base+$026C.
Port K
Port K pull-up resistors are enabled out of reset, i.e. Bit 7 = PUKE = 1 in the register PUCR at
Base+$000C. Therefore care must be taken not to clear this bit.
Port M[1:0]
PM1:0 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
Port P6
PP6 must be configured as output or its pull resistor must be enabled to avoid a floating input.
Port S[3:2]
PS3:2 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
PAD[15:8] (ATD1 channels)
OutofresettheATD1isdisabledpreventingcurrentflowsinthepins.DonotmodifytheATD1
registers!
Document References
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