MC9S12XDP512MAG Freescale, MC9S12XDP512MAG Datasheet - Page 923
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MC9S12XDP512MAG
Manufacturer Part Number
MC9S12XDP512MAG
Description
Manufacturer
Freescale
Datasheet
1.MC9S12XDP512MAG.pdf
(1348 pages)
Specifications of MC9S12XDP512MAG
Cpu Family
HCS12
Device Core Size
16b
Frequency (max)
40MHz
Interface Type
CAN/I2C/SCI/SPI
Total Internal Ram Size
32KB
# I/os (max)
119
Number Of Timers - General Purpose
12
Operating Supply Voltage (typ)
2.5/5V
Operating Supply Voltage (max)
2.75/5.5V
Operating Supply Voltage (min)
2.35/3.15V
On-chip Adc
2(24-chx10-bit)
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
144
Package Type
LQFP
Program Memory Type
Flash
Program Memory Size
512KB
Lead Free Status / RoHS Status
Compliant
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DDRE[7:2]
PE[7:0]
Reset
Field
23.0.5.10 Port E Data Direction Register (DDRE)
Read: Anytime. In emulation modes, read operations will return the data from the external bus, in
all other modes the data source is depending on the data direction value.
Write: Anytime. In emulation modes, write operations will also be directed to the external bus.
Field
7–0
7–0
W
R
DDRE7
Port E — Port E bits 7–0 are associated with external bus control signals and interrupt inputs. These include
mode select (MODB, MODA), E clock, double frequency E clock, Instruction Tagging High and Low (TAGHI,
TAGLO), Read/Write (R/W), Read Enable and Write Enable (RE, WE), Lower Data Select (LDS), IRQ, and XIRQ.
When not used for any of these specific functions, Port E pins 7–2 can be used as general purpose I/O and
pins 1–0 can be used as general purpose inputs.
If the data direction bits of the associated I/O pins are set to logic level “1”, a read returns the value of the port
register, otherwise the buffered pin input state is read.
Pins 6 and 5 are inputs with enabled pull-down devices while RESET pin is low.
Pins 7 and 3 are inputs with enabled pull-up devices while RESET pin is low.
Data Direction Port E — his register controls the data direction for port E. When Port E is operating as a general
purpose I/O port, DDRE determines whether each pin is an input or output. A logic level “1” causes the
associated port pin to be an output and a logic level “0” causes the associated pin to be a high-impedance input.
Port E bit 1 (associated with IRQ) and bit 0 (associated with XIRQ) cannot be configured as outputs. Port E, bits
1 and 0, can be read regardless of whether the alternate interrupt function is enabled.
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Note: Due to internal synchronization circuits, it can take up to 2 bus clock cycles until the correct value is read
7
0
on PORTE after changing the DDRE register.
= Unimplemented or Reserved
DDRE6
0
6
Figure 23-12. Port E Data Direction Register (DDRE)
Table 23-12. PORTE Field Descriptions
Table 23-13. DDRE Field Descriptions
DDRE5
5
0
DDRE4
0
4
Description
Description
DDRE3
3
0
DDRE2
0
2
1
0
0
0
0
0
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