M16C62 Datasheet, PDF (106/231 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock asynchronous serial I/O (UART) mode
Mitsubishi microcomputers
M16C / 62 Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.14.7 lists the functions of the input/output pins during UART mode. This table shows the pin
_______ _______
functions 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 1.14.7. Input/output pin functions in UART mode
Pin name
Function
TxDi
Serial data
(P63, P67, P70) _output
RxDi
Serial data
(P62, P66, P71) input
Method of selection
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
(P61, P65)
Programmable Internal/external clock select bit (bit 3 at address 03A016, 03A816) = “0”
I/O port
Transfer clock Internal/external clock select bit (bit 3 at address 03A016, 03A816) = “1”
input
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 CTS/RTS disable bit (bit 4 at address 03A416, 03AC16) = “1”
I/O port
________ _______
(when separate CTS/RTS pins function is not selected)
Note 1: Since CLK2(P72) does not have external port, use internal as UART2 transfer clock.
_______ _______
Note 2: Since CTS2/RTS2(P73) does not have external port, select CTS/RTS function inhavit (bit 4 at address
037C16 = “1”).
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