參數(shù)資料
型號(hào): AM8530H
廠商: Advanced Micro Devices, Inc.
英文描述: Serial Communications Controller
中文描述: 串行通信控制器
文件頁(yè)數(shù): 139/194頁(yè)
文件大?。?/td> 797K
代理商: AM8530H
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Register Description
AMD
6–29
RxD input. Transmitted data are never seen inside or outside the SCC in this mode, and
CTS
is ignored as a transmit enable. This bit is reset by a channel or hardware reset.
Bit 2: DTR/Transmit DMA Request Function
This bit selects the function of the
DTR
/
REQ
pin. If this bit is set to ‘0’, the
DTR
/
REQ
pin
follows the inverted state of the DTR bit in WR5. If this bit is set to ‘1’, the
DTR
/
REQ
pin
goes Low whenever the transmit buffer becomes empty and in any of the synchronous
modes when CRC has been sent at the end of a message. The request function on the
DTR
/
REQ
pin differs from the transmit request function available on the
W
/
REQ
pin in
that Request does not go inactive until the internal operation satisfying the request is
complete, which occurs four to five PCLK cycles after the rising edge of READ or WRITE.
If the DMA used is edge-triggered, this difference is unimportant. This bit is reset by a
channel or hardware reset.
Bit 1: Baud Rate Generator Source
This bit selects the source of the clock for the baud rate generator. If this bit is set to ‘0’,
the baud rate generator clock comes from either the
RTxC
pin or the XTAL oscillator (de-
pending on the state of the XTAL/no XTAL bit). If this bit is set to ‘1’, the clock for the
baud rate generator is the SCC’s PCLK input. Hardware reset sets this bit to ‘0’, select-
ing the
RTxC
pin as the clock source for the baud rate generator.
Bit 0: Baud Rate Generator Enable
This bit controls the operation of the baud rate generator. The counter in the baud rate
generator is enabled for counting when this bit is set to ‘1’, and counting is inhibited when
this bit is set to ‘0’. When this bit is set to ‘1’, change in the state of this bit is not reflected
by the output of the baud rate generator for two counts of the counter. This allows the
command to be synchronized. However, when set to ‘0’, disabling is immediate. This bit is
reset by a hardware reset.
6.2.16
Write Register 15 (External/S tatus Interrupt
Control)
WR15 is the External/Status source control register. If the External/Status interrupts are
enabled as a group via WR1, bits in this register control which External/Status conditions
can cause an interrupt. Only the External/Status conditions that occur after the controlling
bit is sent to ‘1’, will cause an interrupt. This is true even if an External/Status condition is
pending at the time the bit is set. Bit positions for WR15 are shown in Figure 6–17.
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
DCD IE
SYNC/HUNT IE
CTS IE
Tx Underrun/EOM IE
SDLC/HDLC Enhancement Enable
Zero Count IE
10 x 19-Bit Frame Status FIFO Enable
Break/Abort IE
Figure 6–17. Write Register 15
相關(guān)PDF資料
PDF描述
AM85C30-10PC Enhanced Serial Communications Controller
Am85C30 Serial Communications Controller
AM85C30 Enhanced Serial Communications Controller
AM85C30-8PC Enhanced Serial Communications Controller
AM85C30-16JC Enhanced Serial Communications Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM8530H/AM85C301992 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Am8530H/Am85C30 1992 - Am8530H/Am85C30 Serial Communications Controller
AM8530H-4DC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller
AM8530H-4DCB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller
AM8530H-4JC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller