參數(shù)資料
型號(hào)： MC68HC11EA9MFN3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁(yè)數(shù)： 24/58頁(yè)
文件大?。?/td> 583K
代理商： MC68HC11EA9MFN3
MOTOROLA
MC68HC11EA9
30
MC68HC11EA9TS/D
XPIN — XIRQ Interrupt Pin Status Flag
This is a read-only bit. XPIN reflects the logic level present on the XIRQ pin.
0 = XIRQ pin low.
1 = XIRQ pin high.
IPIN — IRQ Interrupt Pin Status Flag
This is a read-only bit. IPIN reflects the logic level present on the IRQ pin.
0 = IRQ pin low.
1 = IRQ pin high.
XPIN and IPIN are read-only status bits that reflect the logic levels present on the XIRQ and IRQ pins.
XPIN and IPIN provide the data bits that allow the XIRQ and IRQ pins to be used as general-purpose
inputs. However, to use XIRQ and IRQ as data inputs, the interrupts normally generated by these two
pins must be disabled with the DISX and DISI bits in the DDRD register.
After reset PD[1:0] are configured as high-impedance inputs. PD[1:0] share functions with the SCI sys-
tem. 8 Serial Communications Interface details information regarding port D SCI functions.
DISX — Disable XIRQ Pin Interrupts
Can be read anytime. Can be written only once. Any write to the DDRD register will prevent modification
of this bit. This bit must be set to use the XIRQ pin as a data input.
0 = Interrupts generated by the XIRQ pin function are enabled
1 = Interrupts generated by the XIRQ pin function are disabled
DISI — Disable IRQ Pin Interrupts
Can be read anytime. Can be written only once. Any write to the DDRD register will prevent modification
of this bit. This bit must be set to use the IRQ pin as a data input.
0 = Interrupts generated by the IRQ pin function are enabled
1 = Interrupts generated by the IRQ pin function are disabled
DDD[1:0] — Data Direction for PD[1:0]
0 = Corresponding port D pin configured for input
1 = Corresponding port D pin configured for output
Port E has eight general-purpose input pins and shares functions with the A/D converter system. When
any port E pins are being used as A/D inputs, PORTE should not be read during the sample portion of
an A/D conversion. Refer to 9 Analog-to-Digital Converter for more information.
PORTD — Port D Data
$1008
BIT 7
654321
BIT 0
XPIN
IPIN
————
PD1
PD0
RESET:
00000000
Alt. Pin
Func.:
——————
TxD
RxD
DDRD — Port D Data Direction
$1009
BIT 7
654321
BIT 0
DISX
DISI
————
DDD1
DDD0
RESET:
00000000
PORTE — Port E Data
$100A
BIT 7
654321
BIT 0
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
RESET:
IIIIIIII
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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