M30201 datasheet(86/172 Pages) RENESAS

86 / 172 page

Mitsubishi microcomputers

M30201 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Serial I/O

Figure 1.79. UARTi transmit/receive mode register in UART mode

Clock asynchronous serial I/O (UART) mode

Symbol

Address

When reset

UiMR(i=0,1)

03A016, 03A816

0016

CKDIR

UARTi transmit / receive mode registers

Internal / external clock

select bit (Note 1)

STPS

PRY

PRYE

SLEP

0 : Internal clock (Note 2)

1 : External clock (Note 3)

Bit name

Function

Bit symbol

b7 b6

b1 b0

SMD0

SMD1

SMD2

Serial I/O mode select bit

b2 b1 b0

0 : One stop bit

1 : Two stop bits

0 : Parity disabled

1 : Parity enabled

0 : Sleep mode deselected

1 : Sleep mode selected

1 0 0 : Transfer data 7 bits long

1 0 1 : Transfer data 8 bits long

1 1 0 : Transfer data 9 bits long

Valid when bit 6 = “1”

0 : Odd parity

1 : Even parity

Stop bit length select bit

Odd / even parity

select bit

Parity enable bit

Sleep select bit

Note 1: UART1 can use only internal clock. Must set this bit to “1”.

Note 2: Set the corresponding port direction register to “1” (output mode).

Note 3: Set the corresponding port direction register to “0” (input mode).

Table 1.28 lists the functions of the input/output pins during UART mode. 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 1.28. Input/output pin functions in UART mode

Pin name

Function

Method of selection

TxDi

(P50, P40)

Serial data output

Serial data input

Programmable I/O port

Transfer clock input

RxDi

(P51, P42)

CLK0

(P52)

Internal/external clock select bit (bit 3 at address 03A016) = “0”

Internal/external clock select bit (bit 3 at address 03A016) = “1”

Port P51 and P42 direction register (bit 1 at address 03EB16, bit 2 at

address 03EA16)= “0”

(Can be used as an input port when performing transmission only)

Port P51 and P42 direction register (bit 0 at address 03EB16, bit 0 at

address 03EA16)= “1”

(Can be used as an input port when performing reception only)

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