Renesas M16C Series User Manual page 105

M30240 Group
Table 1.26 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
TxD pin outputs a "H". The typical clock synchronous timing diagrams are shown in Figure 1.82.
Table 1.26: IART mode input/output pin functions
Pin name Function
TxDi
Serial data
(P6 , P6 , P7 )
output
3 7 0
RxDi
Serial data input
(P6 , P6 , P7 )
2 6 1
Transfer clock
output
CLKi
(P6 , P6 , P7 )
1 5 2
Transfer clock
input
CTS input
CTSi/RTSi
(P6 ,P6 ,P7 )
0 4 3
RTS output
Programmable I/
O port
Rev.1.00 Sep 24, 2003 Page 87 of 360
(Outputs dummy data when performing reception only)
Port P6 , P6 , and P7 direction register (bits 2 and 6 at address 03EE
2 6 1
03EF )= "0"
16
(Can be used as an input port when performing transmission only.)
Internal/external clock select bit (bit 3 at address 03A0
Internal/external clock select bit (bit 3 at address 03A0
Port P6 , P6 , and P7 direction register (bits 1 and 5 at address 03EE
1 5 2
03EF ) = "0"
16
CTS/RTS disable bit (bit 4 at address 03A4
CTS/RTS function select bit (bit 2 at address 03A4
Port P6 , P6 and P7 direction register (bits 0 and 4 at address 03EE
0 4 3
03EF ) = "0"
16
CTS/RTS disable bit (bit 4 at address 03A4
CTS/RTS function select bit (bit 2 at address 03A4
CTS/RTS disable bit (bit 4 at address 03A4
Method of selection
, 03A8
16 16
, 03A8
16 16
, 03AC , 037C ) = "0"
16 16 16
, 03AC , 037C
16 16
, 03AC , 037C ) = "0"
16 16 16
, 03AC , 037C
16 16
, 03AC , 037C ) = "1"
16 16 16
UART0 to UART2
bit 1 at address
16
, 0378 ) = "0"
16
, 0378 ) = "1"
16
, bit 2 at address
16
) = "0"
16
, bit 3 at address
16
) = "1"
16