MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Serial Communications Interface Modules (SCI1 and SCI2)
Memory Map and Registers
PUPSCI — Pullup Enable Bit
This read/write bit enables the pullups on pins TXD and RXD. If a pin
is programmed as an output, the pullup is disabled.
1 = TXD and RXD pullups enabled
0 = TXD and RXD pullups disabled
16.7.8 SCI Port Data Register
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Freescale Semiconductor, I
Address: SCI1 — 0x00cc_0009
SCI2 — 0x00cd_0009
Read:
Write:
Bit 7 6 5 4 3 2 1 Bit 0
RSVD7 RSVD6 RSVD5 RSVD4 RSVD3 RSVD2 PORTSC1 PORTSC0
Reset: 0 0 0 0 0 0 0 0
Pin function: TXD RXD
Figure 16-11. SCI Port Data Register (SCIPORT)
Read: Anytime; when DDRSCx = 0, its pin is configured as an input, and
reading PORTSCx returns the pin level; when DDRSCx = 1, its pin is
configured as an output, and reading PORTSCx returns the pin driver
input level.
Write: Anytime; data stored in internal latch drives pin only if DDRSC
bit = 1
RSVD[7:2] — Reserved
Writing to these read/write bits updates their values but has no effect
on functionality.
PORTSC[1:0] — SCIPORT Data Bits
These are the read/write data bits of the SCI port.
NOTE:
Writes to SCIPORT do not change the pin state when the pin is
configured for SCI input.
To ensure correct reading of the SCI pin values from SCIPORT, always
wait at least one cycle after writing to SCIDDR before reading SCIPORT.
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA Serial Communications Interface Modules (SCI1 and SCI2) 347
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