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| 型號(hào)： | 38D5 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 46/141頁(yè) |
| 文件大?。?/td> | 2027K |
| 代理商： | 38D5 |
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Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 46 of 134
38D5 Group
Fig. 37 Structure of serial I/O1 related registers
b7 b0
b7 b0
b7 b0
BRG count source selection bit (CSS)
0:
φ
SOURCE
1:
φ
SOURCE/4
Serial I/O1 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.
S
RDY1
output enable bit (SRDY)
0: P4
3
pin operates as ordinary I/O pin
1: P4
3
pin operates as S
RDY1
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/O1 mode selection bit (SIOM)
0: Clock asynchronous (UART) serial I/O
1: Clock synchronous serial I/O
Serial I/O1 enable bit (SIOE)
0: Serial I/O1 disabled
(pins P4
0
to P4
3
operate as ordinary I/O pins)
1: Serial I/O1 enabled
(pins P4
0
to P4
3
operate as serial I/O pins)
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
Not used (returns “1” when read)
Serial I/O1 control register
(SIO1CON : address 001A
16
)
Serial I/O1 status register
(SIO1STS : address 0019
16
)
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
P4
1
/TXD P-channel output disable bit (POFF)
0: CMOS output (in output mode)
1: N-channel open drain output (in output mode)
Not used (return “1” when read)
UART control register
(UARTCON : address 001B
16
)
(1)
Note1:
φ
SOURCE indicates the followings:
X
IN
input in the frequency/2, 4, or 8 mode
On-chip oscillator divided by 4 in the on-chip oscillator mode
Sub-clock in the low-speed mode
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