S9S08AW16A FREESCALE [Freescale Semiconductor, Inc], S9S08AW16A Datasheet - Page 94

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

1
1
Chapter 6 Parallel Input/Output
6.7.5
Port C parallel I/O function is controlled by the registers listed below.
94
PTBDS[3:0]
Bits 7 through 4 are reserved bits that must always be written to 0.
Bit 6 is a reserved bit that must always be written to 0.
PTCD[5:0]
Reset
Reset
Field
Field
3:0
5:0
W
W
R
R
Port C I/O Registers (PTCD and PTCDD)
Output Drive Strength Selection for Port B Bits — Each of these control bits selects between low and high
output drive for the associated PTB pin.
0 Low output drive enabled for port B bit n.
1 High output drive enabled for port B bit n.
Port C Data Register Bits — For port C pins that are inputs, reads return the logic level on the pin. For port C
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 C pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTCD 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
0
7
7
Figure 6-19. Output Drive Strength Selection for Port B (PTBDS)
R
R
0
0
6
6
Table 6-10. PTBDS Register Field Descriptions
Table 6-11. PTCD Register Field Descriptions
Figure 6-20. Port C Data Register (PTCD)
MC9S08AC16 Series Data Sheet, Rev. 8
PTCD5
R
0
0
5
5
PTCD4
R
0
0
4
4
Description
Description
PTBDS3
PTCD3
3
0
3
0
PTBDS2
PTCD2
1
0
0
2
2
1
PTBDS1
Freescale Semiconductor
PTCD1
0
0
1
1
PTBDS0
PTCD0
0
0
0
0