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MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 125
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Chapter 6 Parallel Input/Output Control
6.7.3.5 Port C Toggle Register (PTCTOG)
6.7.3.6 Port C Pull Enable Register (PTCPE)
The port C pull enable register enables pull-ups on the corresponding PTC pin. In some cases, a pull-down
device is enabled if pull-downs are supported by an alternate pin function (e.g., KBI).
Table 6-14. PTCCLR Register Field Descriptions
Field Description
7–0
PTCCLRn
Data Clear for Port C Bits. Writing 0 to any bit in this location clears the corresponding bit in the data register.
Writing a one to any bit in this register has no effect.
0 Corresponding PTCDn maintains current value.
1 Corresponding PTCDn is cleared.
76543210
R
W PTCTOG7 PTCTOG6 PTCTOG5 PTCTOG4 PTCTOG3 PTCTOG2 PTCTOG1 PTCTOG0
Reset:00000000
Figure 6-18. Port C Toggle Enable Register (PTCTOG)
Table 6-15. PTCTOG Register Field Descriptions
Field Description
7–0
PTCTOGn
Toggle Enable for Port C Bits. Writing 1 to any bit in this location toggles the corresponding bit in the data register.
Writing a zero to any bit in this register has no effect.
0 Corresponding PTCDn maintains current value.
1 Corresponding PTCDn is toggled once.
76543210
R
PTCPE7 PTCPE6 PTCPE5 PTCPE4 PTCPE3 PTCPE2 PTCPE1 PTCPE0
W
Reset:00000000
Figure 6-19. Internal Pull Enable for Port C Register (PTCPE)
Table 6-16. PTCPE Register Field Descriptions
Field Description
7–0
PTCPEn
Internal Pull Enable for Port C Bits. Each of these control bits determines if the internal pull-up device is enabled
for the associated PTC pin. For port C pins configured as outputs, these bits have no effect and the internal pull
devices are disabled.
0 Internal pull-up device disabled for port C bit n.
1 Internal pull-up device enabled for port C bit n.