mc9s08ac16 Freescale Semiconductor, Inc, mc9s08ac16 Datasheet - Page 93

• Manufacturer Part Number: mc9s08ac16
• Description: Hcs08 Microcontrollers 8-bit Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1
1
6.7.4
In addition to the I/O control, port B pins are controlled by the registers listed below.
Freescale Semiconductor
PTBPE[3:0]
PTBSE[3:0]
Bits 7 through 4 are reserved bits that must always be written to 0.
Bits 7 through 4 are reserved bits that must always be written to 0.
Reset
Reset
Field
Field
3:0
3:0
W
W
R
R
Port B Pin Control Registers (PTBPE, PTBSE, PTBDS)
Internal Pullup Enable for Port B Bits — Each of these control bits determines if the internal pullup device is
enabled for the associated PTB pin. For port B pins that are configured as outputs, these bits have no effect and
the internal pullup devices are disabled.
0 Internal pullup device disabled for port B bit n.
1 Internal pullup device enabled for port B bit n.
Output Slew Rate Control Enable for Port B Bits— Each of these control bits determine whether output slew
rate control is enabled for the associated PTB pin. For port B pins that are configured as inputs, these bits have
no effect.
0 Output slew rate control disabled for port B bit n.
1 Output slew rate control enabled for port B bit n.
R
R
0
0
7
7
Figure 6-18. Output Slew Rate Control Enable (PTBSE)
Figure 6-17. Internal Pullup Enable for Port B (PTBPE)
R
R
0
0
6
6
Table 6-8. PTBPE Register Field Descriptions
Table 6-9. PTBSE Register Field Descriptions
MC9S08AC16 Series Data Sheet, Rev. 0
R
R
0
0
5
5
PRELIMINARY
R
R
0
0
4
4
Description
Description
PTBPE3
PTBSE3
3
0
3
0
PTBPE2
PTBSE2
0
0
2
2
1
1
Chapter 6 Parallel Input/Output
PTBPE1
PTBSE1
0
0
1
1
PTBPE0
PTBSE0
0
0
0
0
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