M16C30_02 Datasheet, PDF (107/178 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock synchronous serial I/O mode
Mitsubishi microcomputers
M16C / 30 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.16.4 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 an “H”. (If the N-channel open-drain is selected, this pin is in floating state.)
Table 1.16.4. Input/output pin functions in clock synchronous serial I/O mode
(when transfer clock output from multiple pins is not selected)
Pin name
Function
Method of selection
TxDi
Serial data output
(P63, P67, P70)
(Outputs dummy data when performing reception only)
RxDi
Serial data input
(P62, P66, P71)
Port P62, P66 and P71 direction register (bits 2 and 6 at address 03EE16,
bit 1 at address 03EF16)= “0”
(Can be used as an input port when performing transmission only)
CLKi
Transfer clock output
(P61, P65, P72)
Transfer clock input
Internal/external clock select bit (bit 3 at address 03A016, 03A816, 037816) = “0”
Internal/external clock select bit (bit 3 at address 03A016, 03A816, 037816) = “1”
Port P61, P65 and P72 direction register (bits 1 and 5 at address 03EE16,
bit 2 at address 03EF16) = “0”
CTSi/RTSi CTS input
(P60, P64, P73)
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) =“0”
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16, 037C16) = “0”
Port P60, P64 and P73 direction register (bits 0 and 4 at address 03EE16,
bit 3 at address 03EF16) = “0”
RTS output
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) = “0”
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16, 037C16) = “1”
Programmable I/O port CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) = “1”
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