M16C62N Datasheet, PDF (100/213 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock synchronous serial I/O mode
Mitsubishi microcomputers
M16C / 62N Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.14.4 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 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 1.14.4. 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
(P63, P67)
Serial data output (Outputs dummy data when performing reception only)
RxDi
(P62, P66)
Serial data input
Port P62 and P66 direction register (bits 2 and 6 at address 03EE16)= “0”
(Can be used as an input port when performing transmission only)
CLKi
(P61, P65)
Transfer clock output Internal/external clock select bit (bit 3 at address 03A016, 03A816) = “0”
Transfer clock input
Internal/external clock select bit (bit 3 at address 03A016, 03A816) = “1”
Port P61 and P65 direction register (bits 1 and 5 at address 03EE16) = “0”
CTSi/RTSi
(P60, P64)
CTS input
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16) =“0”
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16) = “0”
Port P60 and P64 direction register (bits 0 and 4 at address 03EE16) = “0”
RTS output
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16) = “0”
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16) = “1”
Programmable I/O
port
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16) = “1”
Note: Clock synchronous serial I/O mode cannot be used in UART2.
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