Datasheet

Chapter 6 Parallel Input/Output
MC9S08JM16 Series Data Sheet, Rev. 2
84 Freescale Semiconductor
6.5.5 Port C I/O Registers (PTCD and PTCDD)
Port C parallel I/O function is controlled by the registers listed below.
76543210
R
PTBDS5 PTBDS4 PTBDS3 PTBDS2 PTBDS1 PTBDS0
W
Reset
00000000
Figure 6-11. Output Drive Strength Selection for Port B (PTBDS)
Table 6-10. PTBDS Register Field Descriptions
Field Description
5:0
PTBDS[5:0]
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.
76543210
R
PTCD5 PTCD4 PTCD3 PTCD2 PTCD1 PTCD0
W
Reset00000000
Figure 6-12. Port C Data Register (PTCD)
Table 6-11. PTCD Register Field Descriptions
Field Description
5:0
PTCD[5:0]
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.