Serial Switch Register (Ssel) - Fujitsu F2MC-8L F202RA Hardware Manual

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)
bit7 bit6
Address
003B
H
: Readable/Writable
R/W
: Unused
: Initial value
Table 13.4-5 Description of the Serial Switch Register (SSEL) Bits
Bit name
bit7
to Unused bits
bit1
SSEL:
bit0
Serial switch bit
Figure 13.4-9 Serial Switch Register (SSEL)
bit5 bit4 bit3 bit2
SSEL
0 Sets UART.
1
Sets 8-bit serial I/O.
• The values read out from these bits are undefined.
• Writing values to these bits does not affect any operations.
• When this bit is "0", UART is used.
• When this bit is "1", 8-bit serial I/O is used.
bit1 bit0
Initial value
SSEL
-------0
B
R/W
Serial switch bit
Description
CHAPTER 13 UART
301