M16C Datasheet, PDF (123/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CSelorciakl sI/yOnchronous serial I/O mode
Table 12-4 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 and the separate CTS/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 12-4. Input/output pin functions in clock synchronous serial I/O mode
Pin name
Function
TxDi
Serial data output
(P63, P67, P70)
Method of selection
(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, 01F816) = “0”
Internal/external clock select bit (bit 3 at address 03A016, 03A816, 01F816) = “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, 01FC16) =“0”
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16, 01FC16) = “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, 01FC16) = “0”
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16, 01FC16) = “1”
Programmable I/O port CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 01FC16) = “1”
(when transfer clock output from multiple pins and separate CTS/RTS pins functions are not selected)
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