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參數(shù)資料
| 型號(hào)： | CD1865 |
| 廠商： | Intel Corp. |
| 英文描述： | Intelligent Eight-Channel Communications Controller |
| 中文描述： | 智能八通道通信控制器 |
| 文件頁數(shù)： | 100/150頁 |
| 文件大?。?/td> | 871K |
| 代理商： | CD1865 |
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CD1865
—
Intelligent Eight-Channel Communications Controller
100
Datasheet
9.2.2.2
Prescaler Period Registers (High/Low)
These two registers provide the initialization value for the Timer Prescaler that is clocked by the
system clock. This establishes the clock for the various on-device timers.
The value loaded into these registers must establish a clock period of at least 1.0 msec. For a clock
speed of 33 MHz, the value must be 33,000 (decimal) or larger. The values in these registers are
programmed to be FF (Hex) automatically upon a hardware reset.
9.2.2.3
Modem Service Match Register
This register must contain the value for Modem Signal Change Service Requests that are presented
on the Address Bus A0-A6 by the host to indicate the type of service request being acknowledged
when ACKIN* is asserted. This register, along with the other two Match registers, is compared to
the value on the Address Bus during acknowledgment cycles so that the CD1865 can determine the
service request being acknowledged by the host.
Bit 7 must be programmed to a
‘
1
’
. The CD1865 compares all eight bits internally, but there are
only seven address lines. Bits 6:0 of the register are compared to A6:A0 of the Address Bus. Bit 7
of the register is compared with a logic
‘
1
’
.
Within any one CD1865, the three Match registers must have unique values. In multiple CD1865
designs where service acknowledgments are cascaded, all Match registers of the same type (for
example, Modem) must have the same value.
Register Name: PPRH
Register Description: Prescaler Period Register (High)
Default Value: FF
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: $70
Intel Hex Address: $E0
Motorola Hex Address: $E1
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Binary Value
Register Name: PPRL
Register Description: Prescaler Period Register (Low)
Default Value: FF
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: $71
Intel Hex Address: $E2
Motorola Hex Address: $E3
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Binary Value
Register Name:
Register Description: Modem Service Match Register
Default Value: 0
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: $61
Intel Hex Address: $C2
Motorola Hex Address: $C3
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Binary Value
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CD1865N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1865P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1866N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1866P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1867N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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