mc9s08ac16 Freescale Semiconductor, Inc, mc9s08ac16 Datasheet - Page 101
mc9s08ac16
Manufacturer Part Number
mc9s08ac16
Description
Hcs08 Microcontrollers 8-bit Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08AC16.pdf
(338 pages)
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6.7.9
Port E parallel I/O function is controlled by the registers listed below.
Freescale Semiconductor
PTEDD[7:0]
PTED[7:0]
Reset
Reset
Field
Field
7:0
7:0
W
W
R
R
PTEDD7
PTED7
Port E I/O Registers (PTED and PTEDD)
Port E Data Register Bits — For port E pins that are inputs, reads return the logic level on the pin. For port E
pins that are configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port E pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTED to all 0s, but these 0s are not driven out the corresponding pins because reset also configures
all port pins as high-impedance inputs with pullups disabled.
Data Direction for Port E Bits — These read/write bits control the direction of port E pins and what is read for
PTED reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port E bit n and PTED reads return the contents of PTEDn.
0
0
7
7
PTEDD6
PTED6
0
0
6
6
Table 6-22. PTEDD Register Field Descriptions
Figure 6-31. Data Direction for Port E (PTEDD)
Table 6-21. PTED Register Field Descriptions
Figure 6-30. Port E Data Register (PTED)
PTEDD5
MC9S08AC16 Series Data Sheet, Rev. 0
PTED5
0
0
5
5
PRELIMINARY
PTEDD4
PTED4
0
0
4
4
Description
Description
PTEDD3
PTED3
3
0
3
0
PTEDD2
PTED2
0
0
2
2
Chapter 6 Parallel Input/Output
PTEDD1
PTED1
0
0
1
1
PTEDD0
PTED0
0
0
0
0
101
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