mc68hc11ea9 Freescale Semiconductor, Inc, mc68hc11ea9 Datasheet - Page 30

• Manufacturer Part Number: mc68hc11ea9
• Description: 8-bit Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

PORTD — Port D Data
XPIN — XIRQ Interrupt Pin Status Flag
IPIN — IRQ Interrupt Pin Status Flag
DDRD — Port D Data Direction
DISX — Disable XIRQ Pin Interrupts
DISI — Disable IRQ Pin Interrupts
DDD[1:0] — Data Direction for PD[1:0]
PORTE — Port E Data
30
RESET:
RESET:
RESET:
Alt. Pin
Func.:
This is a read-only bit. XPIN reflects the logic level present on the XIRQ pin.
This is a read-only bit. IPIN reflects the logic level present on the IRQ pin.
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.
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.
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.
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.
0 = XIRQ pin low.
1 = XIRQ pin high.
0 = IRQ pin low.
1 = IRQ pin high.
0 = Interrupts generated by the XIRQ pin function are enabled
1 = Interrupts generated by the XIRQ pin function are disabled
0 = Interrupts generated by the IRQ pin function are enabled
1 = Interrupts generated by the IRQ pin function are disabled
0 = Corresponding port D pin configured for input
1 = Corresponding port D pin configured for output
BIT 7
XPIN
BIT 7
DISX
BIT 7
PE7
—
0
0
I
IPIN
DISI
PE6
—
6
0
6
0
6
I
Freescale Semiconductor, Inc.
For More Information On This Product,
PE5
—
—
—
5
0
5
0
5
I
Go to: www.freescale.com
PE4
—
—
—
4
0
4
0
4
I
PE3
—
—
—
3
0
3
0
3
I
PE2
—
—
—
2
0
2
0
2
I
DDD1
PD1
TxD
PE1
1
0
1
0
1
I
MC68HC11EA9TS/D
DDD0
BIT 0
BIT 0
BIT 0
PD0
RxD
PE0
0
0
I
MC68HC11EA9
$100A
$1008
$1009