S9S08AW16A FREESCALE [Freescale Semiconductor, Inc], S9S08AW16A Datasheet - Page 99

• Manufacturer Part Number: S9S08AW16A
• Description: HCS08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1
6.7.9
Port E parallel I/O function is controlled by the registers listed below.
Freescale Semiconductor
PTDDS[3:0]
Bits 7 through 4 are reserved bits that must always be written to 0.
PTED[7:0]
Reset
Reset
Field
Field
3:0
7:0
W
W
R
R
PTED7
Port E I/O Registers (PTED and PTEDD)
Output Drive Strength Selection for Port D Bits — Each of these control bits selects between low and high
output drive for the associated PTD pin.
0 Low output drive enabled for port D bit n.
1 High output drive enabled for port D bit n.
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.
R
0
0
7
7
Figure 6-29. Output Drive Strength Selection for Port D (PTDDS)
PTED6
R
0
0
6
6
Table 6-20. PTDDS Register Field Descriptions
Table 6-21. PTED Register Field Descriptions
Figure 6-30. Port E Data Register (PTED)
MC9S08AC16 Series Data Sheet, Rev. 8
PTED5
R
0
0
5
5
PTED4
R
0
0
4
4
Description
Description
PTDDS3
PTED3
3
0
3
0
PTDDS2
PTED2
0
0
2
2
Chapter 6 Parallel Input/Output
1
PTDDS1
PTED1
0
0
1
1
PTDDS0
PTED0
0
0
0
0
99