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I/O Port Programming
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
73
7.5.6 Resistor Control Register 1
Bits 7–4 — Reserved
These bits are not used and always read as zero.
RBH — Port B Pullup Resistor (H)
When this bit is set, the pullup resistor is connected to the upper four bits of port B. However, for those
pins configured as CMOS output or open-drain output with output of logic low, the pullup resistors are
disabled. This bit is cleared on reset.
RBL — Port B Pullup Resistor (L)
When this bit is set, the pullup resistor is connected to the lower four bits of port B. However, for those
pins configured as CMOS output or open-drain output with output of logic low, the pullup resistors are
disabled. This bit is cleared on reset.
RAH — Port A Pullup Resistor (H)
When this bit is set, the pullup resistor is connected to the upper four bits of port A. However, for those
pins configured as CMOS output or open-drain output with output of logic low, the pullup resistors are
disabled. This bit is cleared on reset.
RAL — Port A Pullup Resistor (L)
When this bit is set, the pullup resistor is connected to the lower four bits of port A. However, for those
pins configured as CMOS output or open-drain output with output of logic low, the pullup resistors are
disabled. This bit is cleared on reset.
7.5.7 Resistor Control Register 2
Bits 7:1 — Reserved
These bits are not used and always read as zero.
RC — Port C Pullup Resistor
When the RC bit is set, the pullup resistor is connected to all four bits of port C. However, for those
pins configured as CMOS output or open-drain output with output of logic low, the pullup resistors are
disabled. This bit is cleared on reset.
Address:
Option — $0008
Bit 7
654321
Bit 0
Read:
0000
RBH
RBL
RAH
RAL
Write:
Reset:
00000000
= Unimplemented
Figure 7-19. Resistor Control Register 1 (RCR1)
Address:
Option — $0009
Bit 7
654321
Bit 0
Read:
0000000
RC
Write:
Reset:
00000000
= Unimplemented
Figure 7-20. Resistor Control Register 2 (RCR2)
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