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| 型号： | 7549 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 35/73页 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 35 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
[Transmit buffer register/receive buffer register (TB/
RB)] 0018
16
The transmit buffer register and the receive buffer register are
located at the same address. The transmit buffer is write-only and
the receive buffer is read-only. If a character bit length is 7 bits,
the MSB of data stored in the receive buffer is “0”.
[Serial I/O status register (SIOSTS)] 0019
16
The read-only serial I/O status register consists of seven flags
(bits 0 to 6) which indicate the operating status of the serial I/O
function and various errors.
Three of the flags (bits 4 to 6) are valid only in UART mode.
The receive buffer full flag (bit 1) is cleared to “0” when the
receive buffer register is read.
If there is an error, it is detected at the same time that data is
transferred from the receive shift register to the receive buffer
register, and the receive buffer full flag is set. A write to the
serial I/O status register clears all the error flags OE, PE, FE, and
SE (bit 3 to bit 6, respectively). Writing “0” to the serial I/O
enable bit SIOE (bit 7 of the serial I/O control register) also
clears all the status flags, including the error flags.
Bits 0 to 6 of the serial I/O status register are initialized to “0” at
reset, but if the transmit enable bit of the serial I/O control
register has been set to “1”, the transmit shift completion flag (bit
2) and the transmit buffer empty flag (bit 0) become “1”.
[Serial I/O control register (SIOCON)] 001A
16
The serial I/O control register consists of eight control bits for
the serial I/O function.
[UART control register (UARTCON)] 001B
16
The UART control register consists of four control bits (bits 0 to
3) which are valid when asynchronous serial I/O is selected and
set the data format of an data transfer and one bit (bit 4) which is
always valid and sets the output structure of the P0
5
/TxD pin.
[Baud rate generator (BRG)] 001C
16
The baud rate generator determines the baud rate for serial
transfer.
The baud rate generator divides the frequency of the count source
by 1/(n + 1), where n is the value written to the baud rate
generator.
Notes on Serial I/O
Serial I/O interrupt
When setting the transmit enable bit to “1”, the serial I/O
transmit interrupt request bit is automatically set to “1”. When
not requiring the interrupt occurrence synchronized with the
transmission enabled, take the following sequence.
1.Set the serial I/O transmit interrupt enable bit to “0” (dis-
abled).
2.Set the transmit enable bit to “1”.
3.Set the serial I/O transmit interrupt request bit to “0” after 1
or more instructions have been executed.
4.Set the serial I/O transmit interrupt enable bit to “1”
(enabled).
I/O pin function when serial I/O is enabled.
The functions of P0
6
and P0
7
are switched with the setting values
of a serial I/O mode selection bit and a serial I/O synchronous
clock selection bit as follows.
(1) Serial I/O mode selection bit
→
“1” :
Clock synchronous type serial I/O is selected.
Setup of a serial I/O synchronous clock selection bit
“0” : P0
6
pin turns into an output pin of a synchronous clock.
“1” : P0
6
pin turns into an input pin of a synchronous clock.
Setup of a S
RDY
output enable bit (SRDY)
“0” : P0
7
pin can be used as a normal I/O pin.
“1” : P0
7
pin turns into a S
RDY
output pin.
(2) Serial I/O mode selection bit
→
“0” :
Clock asynchronous (UART) type serial I/O is selected.
Setup of a serial I/O synchronous clock selection bit
“0” : P0
6
pin can be used as a normal I/O pin.
“1” : P0
6
pin turns into an input pin of an external clock.
When clock asynchronous (UART) type serial I/O is selected, it
is P0
7
pin. It can be used as a normal I/O pin.
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相关代理商/技术参数 |
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|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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