
Clock synchronous serial I/O mode
deeopmen
Preliminary Specifications REV.E
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30220 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
99
Table 1.15.4 lists the functions of the input/output pins during clock synchronous serial I/O mode. This
table shows the pin functions when the transfer clock output from multiple pins function is not selected.
Note that for a period from when the UARTi operation mode is selected to when transfer starts, the TxDi
pin outputs a “H”. (If the N-channel open-drain is selected, this pin is in floating state.)
Table 1.15.4. Input/output pin functions in clock synchronous serial I/O mode
(when transfer clock output from multiple pins is not selected)
Pin name
TxDi
(P6
3
, P6
7
, P7
0
)
Function
Method of selection
Serial data output
Serial data input
Transfer clock output
Transfer clock input
Programmable I/O port
(Outputs dummy data when performing reception only)
RxDi
(P6
2
, P6
6
, P7
1
)
CLKi
(P6
1
, P6
5
, P7
2
)
Internal/external clock select bit (bit 3 at address 03A0
16
, 03A8
16
, 0378
16
) = “0”
Internal/external clock select bit (bit 3 at address 03A0
16
, 03A8
16
, 0378
16
) = “1”
Port P6
1
, P6
5
and P7
2
direction register (bits 1 and 5 at address 03EE
16
,
bit 2 at address 03EF
16
) = “0”
Port P6
2
, P6
6
and P7
1
direction register (bits 2 and 6 at address 03EE
16
,
bit 1 at address 03EF
16
)= “0”
(Can be used as an input port when performing transmission only)
CTS/RTS disable bit (bit 4 at address 03A4
16
, 03AC
16
, 037C
16
) =“0”
CTS/RTS function select bit (bit 2 at address 03A4
16
, 03AC
16
, 037C
16
) = “0”
Port P6
0
, P6
4
and P7
3
direction register (bits 0 and 4 at address 03EE
16
,
bit 3 at address 03EF
16
) = “0”
CTS/RTS disable bit (bit 4 at address 03A4
16
, 03AC
16
, 037C
16)
= “0”
CTS/RTS function select bit (bit 2 at address 03A4
16
, 03AC
16
, 037C
16
) = “1”
CTS/RTS disable bit (bit 4 at address 03A4
16
, 03AC
16
, 037C
16
) = “1”
CTS input
RTS output
CTSi/RTSi
(P6
0
, P6
4
, P7
3
)