MC68HC912BL16 Datasheet, PDF (17/128 Pages) Freescale Semiconductor, Inc – 16-Bit Microcontroller

Freescale Semiconductor, Inc.
Port S pins serve several functions depending on the various internal control registers. If WOMS bit in
the SC0CR1 register is set, the P-channel drivers of the output buffers are disabled for bits 0 through 1
(2 through 3). If SWOM bit in the SP0CR1 register is set, the P-channel drivers of the output buffers are
disabled for bits 4 through 7. (wired-OR mode). The open drain control effects both the serial and the
general-purpose outputs. If the RDPSx bits in the PURDS register are set, the appropriate port S pin
drive capabilities are reduced. If PUPSx bits in the PURDS register are set, the appropriate pull-up de-
vice is connected to each port S pin which is programmed as a general-purpose input . If the pin is pro-
grammed as a general-purpose output, the pull-up is disconnected from the pin regardless of the state
of the individual PUPSx bits. See 13 Serial Interface.
MC68HC912BL16TS/D
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