399
Table 11.1
External Pins for the Serial I/O (SIO)
Channel Name
Abbr.
I/O
Function
0
Serial receive data input pin
SRxD0
I
Serial data input port 0
Serial receive clock input pin
SRCK0
I
Serial receive clock port 0
Serial receive sync input pin
SRS0
I
Serial receive sync input port 0
Serial transmit data output pin
STxD0
O
Serial data output port 0
Serial transmit clock input pin
STCK0
I
Serial transmit clock port 0
Serial transmit sync output pin
STS0
I/O
Serial transmit sync I/O port 0
1
Serial receive data input pin
SRxD1
I
Serial data input port 1
Serial receive clock input pin
SRCK1
I
Serial receive clock port 1
Serial receive sync input pin
SRS1
I
Serial receive sync input port 1
Serial transmit data output pin
STxD1
O
Serial data output port 1
Serial transmit clock input pin
STCK1
I
Serial transmit clock port 1
Serial transmit sync output pin
STS1
I/O
Serial transmit sync I/O port 1
2
Serial receive data input pin
SRxD2
I
Serial data input port 2
Serial receive clock input pin
SRCK2
I
Serial receive clock port 2
Serial receive sync input pin
SRS2
I
Serial receive sync input port 2
Serial transmit data output pin
STxD2
O
Serial data output port 2
Serial transmit clock input pin
STCK2
I
Serial transmit clock port 2
Serial transmit sync output pin
STS2
I/O
Serial transmit sync I/O port 2
Notes: 1. All pins are initialized to a high-impedance state on reset.
2. SIO external pins are shared for general use IO, and if the appropriate bits of PACR,
PBCR are set so as to become external pins of the SIO:
When TE bit = 0 is set:
STxD pin is Hi-Z
STCK pin ignores input signals
STS pin ignores input signals (when the TM bit = 0), or is Hi-Z (when the TM bit = 1)
results.
When RE bit = 0 is set:
SRxD pin ignores input signals
SRCR pin ignores input signals
SRS pin ignores input signals results.
11.2
Register Configuration
Table 11.2 lists the SIO registers. Because the channels are independent, the channel number is
dropped from the name of the signal in subsequent sections.