M38203M4 Datasheet, PDF (236/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.6 Serial I/O2
sInternal synchronization clock select bits (bit 2–bit 0)
When an internal clock is selected as serial I/O2 synchronization clocks (bit 6 = 1), these bits select
an internal clock division ratio.
Table 2.6.1 Relation between internal synchronization clock selection bit and synchronizing clock
b2 b1 b0
Synchronizing clock of serial I/O2 (when internal clock is selected)
0 0 0 XIN pin input clock/8
0 0 1 XIN pin input clock/16
0 1 0 XIN pin input clock/32
0 1 1 _{XIN pin input clock/64}
1 0 0 _{Do not set.}
10 1
1 1 0 XIN pin input clock/128
1 1 1 XIN pin input clock/256
sSerial I/O2 port selection bit (bit 3)
This bit is used to select the functions of the P51/SOUT2 pin and P52/SCLK2 pin.
When this bit is set to “0,” the I/O port P51 and P52 functions are selected. When the bit is set to “1,”
the SOUT2 and SCLK2 pin functions for serial I/O2 are selected.
sSRDY2 output enable bit (bit 4)
This bit is used to select the P53/SRDY2 pin function.
When this bit is set to “1,” the I/O port P53 function is selected. When the bit is set to “1,” the SRDY2
pin function for serial I/O2 is selected.
sTransfer direction selection bit (bit 5)
This bit is used to select a transfer direction for serial data of the serial I/O2.
When this bit is set to “0,” LSB first (transfer from the least significant bit) is selected. When the bit
is set to “1,” MSB first (transfer from the most significant bit) is selected.
sSynchronization clock selection bit (bit 6)
This bit is used to select a synchronizing clock of the serial I/O2.
When this bit is set to “0,” an external clock is selected. When the bit is set to “1,” an internal clock
is selected.
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