M37544 Datasheet, PDF (30/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
b7
b0 _{Serial I/O status register}
(SIOSTS : address 001916, initial value: 0016)
Transmit buffer empty flag (TBE)
0: Buffer full
1: Buffer empty
Receive buffer full flag (RBF)
0: Buffer empty
1: Buffer full
Transmit shift completion flag (TSC)
0: Transmit shift in progress
1: Transmit shift completed
Overrun error flag (OE)
0: No error
1: Overrun error
Parity error flag (PE)
0: No error
1: Parity error
Framing error flag (FE)
0: No error
1: Framing error
Summing error flag (SE)
0: (OE) U (PE) U (FE)=0
1: (OE) U (PE) U (FE)=1
Disable (returns “1” when read)
b7
b0 _{UART control register}
(UARTCON : address 001B16, initial value: E016)
Character length selection bit (CHAS)
0: 8 bits
1: 7 bits
Parity enable bit (PARE)
0: Parity checking disabled
1: Parity checking enabled
Parity selection bit (PARS)
0: Even parity
1: Odd parity
Stop bit length selection bit (STPS)
0: 1 stop bit
1: 2 stop bits
P11/TXD1 P-channel output disable bit (POFF)
0: CMOS output (in output mode)
1: N-channel open drain output (in output mode)
Disable (return “1” when read)
Fig. 32 Structure of serial I/O-related registers
b7
b0
Serial I/O control register
(SIOCON : address 001A16, initial value: 0016)
BRG count source selection bit (CSS)
0: f(XIN)
1: f(XIN)/4
Serial I/O synchronous clock selection bit (SCS)
0: BRG output divided by 4 when clock synchronous
serial I/O is selected, BRG output divided by 16
when UART is selected.
1: External clock input when clock synchronous serial
I/O is selected, external clock input divided by 16
when UART is selected.
SRDY output enable bit (SRDY)
0: P13 pin operates as ordinary I/O pin
1: P13 pin operates as SRDY output pin
Transmit interrupt source selection bit (TIC)
0: Interrupt when transmit buffer has emptied
1: Interrupt when transmit shift operation is completed
Transmit enable bit (TE)
0: Transmit disabled
1: Transmit enabled
Receive enable bit (RE)
0: Receive disabled
1: Receive enabled
Serial I/O mode selection bit (SIOM)
0: Clock asynchronous (UART) serial I/O
1: Clock synchronous serial I/O
Serial I/O enable bit (SIOE)
0: Serial I/O disabled
(pins P10 to P13 operate as ordinary I/O pins)
1: Serial I/O enabled
(pins P10 to P13 operate as serial I/O pins)
Rev.1.04 2004.06.08 page 30 of 66
REJ03B0012-0104Z