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CHAPTER 13 UART
13.4.7 Serial Switch Register (SSEL)
The serial switch register (SSEL) switches the P30/UCK/SCK, P31/UO/SO, and P32/UI/SI
pins between UART and 8-bit serial I/O.
■ Serial Switch Register (SSEL)
Figure 13.4-9 Serial Switch Register (SSEL)
SSEL
0
1
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
003B
H
SSEL
-------0
B
R/W
R/W
Address
Initial value
Serial switch bit
Sets UART.
Sets 8-bit serial I/O.
: Readable/Writable
: Unused
: Initial value
Table 13.4-5 Description of the Serial Switch Register (SSEL) Bits
Bit name Description
bit7
to
bit1
Unused bits
• The values read out from these bits are undefined.
• Writing values to these bits does not affect any operations.
bit0
SSEL:
Serial switch bit
• When this bit is "0", UART is used.
• When this bit is "1", 8-bit serial I/O is used.