M38203M4 Datasheet, PDF (235/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

2.6.3 Related registers
Figure 2.6.8 shows the memory allocation of the
serial I/O2-related registers. They are the serial
I/O2 control register and serial I/O2 register.
APPLICATION
2.6 Serial I/O2
Address
001D16
Serial I/O2 control register
(SIO2CON)
001F16
Serial I/O2 register
(SIO2)
Fig. 2.6.8 Memory allocation of serial I/O2-related
registers
(1) Serial I/O2 control register (SIO2CON)
The serial I/O2 control register (address 001D16) controls the serial I/O2 function.
Serial I/O2 control register
b7 b6 b5 b4 b3 b2 b1 b0
Serial I/O2 control register (SIO2CON) [Address 1D16]
B
Name
0 ^Internal
synchronization
clock select bits
1
2
Functions
b2b1b0
0 0 0: f(XIN)/8
0 0 1: f(XIN)/16
0 1 0: f(XIN)/32
0 1 1: f(XIN)/64
1 0 0:
1 0 1:
Do not set
1 1 0: f(XIN)/128
1 1 1: f(XIN)/256
3 ^{Serial I/O2 port}
selection bit
0: I/O port (P51, P52)
1: SOUT2, SCLK2 signal output
4 SRDY2 output
enable bit
0: I/O port (P53)
1: SRDY2 signal output
5 Transfer direction
selection bit
0: LSB first
1: MSB first
6 ^{Synchronization}
clock selection bit
0: External clock
1: Internal clock
7 _{Nothing is allocated. This bit cannot be written to and}
is fixed to “0” at reading.
At reset R W
0
0
0
0
0
0
0
0 0×
Fig. 2.6.9 Structure of serial I/O2 control register
3820 GROUP USER’S MANUAL
2–149