
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Clock synchronous serial I/O mode
125
Table 1.19.4 lists the functions of the input/output pins during clock synchronous serial I/O mode. This
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table shows the pin functions when the transfer clock output from multiple pins and the separate CTS/
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RTS pins functions are 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 1.19.4. Input/output pin functions in clock synchronous serial I/O mode
Pin name
Function
Method of selection
TxDi
(P63, P67, P70)
Serial data output
Serial data input
Transfer clock output
Transfer clock input
Programmable I/O port
(Outputs dummy data when performing reception only)
RxDi
(P62, P66, P71)
CLKi
(P61, P65, P72)
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”
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)
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”
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”
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) = “1”
CTS input
RTS output
CTSi/RTSi
(P60, P64, P73)
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(when transfer clock output from multiple pins and separate CTS/RTS pins functions are not selected)