M16C Datasheet, PDF (130/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C / 6N Group
Clock asynchronous serial I/O (UART) mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 13-3 lists the functions of the input/output pins during UART mode. This table shows the pin func-
tions when the separate CTS/RTS 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 a “H”. (If the N-channel
open-drain is selected, this pin is in floating state.)
Table 13-3. Input/output pin functions in UART mode
Pin name
Function
TxDi
Serial data output
(P63, P67, P70)
Method of selection
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
Programmable I/O port
(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 separate CTS/RTS pins function is not selected)
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