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參數(shù)資料
| 型號： | ST68C454CJ68 |
| 廠商： | EXAR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 26/29頁 |
| 文件大小： | 184K |
| 代理商： | ST68C454CJ68 |
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ST16C454
6
Rev. 3.30
R/-W.
-IRQ
15
O
Interrupt Request or Interrupt “A” - This function is associated with the
68 mode only. In the 68 mode, interrupts from UART channels A-D
are WIRE-OR’ed” internally to function as a single IRQ interrupt. This
pin transitions to a logic 0 (if enabled by the interrupt enable register)
whenever a UART channel(s) requires service. Individual channel
interrupt status can be determined by addressing each channel
through its associated internal register, using -CS and A3-A4. In the
68 mode an external pull-up resistor must be connected between this
pin and VCC. The function of this pin changes to INTA when operating
in the 16 mode, see definition under INTA.
-RESET
RESET
37
I
Reset. - In the 16 mode a logic 1 on this pin will reset the internal
registers and all the outputs. The UART transmitter output and the
receiver input will be disabled during reset time. (See ST16C454
External Reset Conditions for initialization details.) When 16/-68
is a logic 0 (68 mode), this pin functions similarly but, as an inverted
reset interface signal, -RESET.
R/-W
18
I
Read/Write Strobe (active low) - This function is associated with
the 68 mode only. This pin provides the combined functions for
Read or Write strobes. A logic 1 to 0 transition transfers the
contents of the CPU data bus (D0-D7) to the register selected by
-CS and A0-A4. Similarly a logic 0 to 1 transition places the
contents of a 454 register selected by -CS and A0-A4 on the data
bus, D0-D7, for transfer to an external CPU.
VCC
13
VCC
47,64
I
Power supply inputs.
XTAL1
35
I
Crystal or External Clock Input - Functions as a crystal input or as
an external clock input. A crystal can be connected between this
pin and XTAL2 to form an internal oscillator circuit (see figure 8).
Alternatively, an external clock can be connected to this pin to
provide custom data rates (see Baud Rate Generator Program-
ming).
XTAL2
36
O
Output of the Crystal Oscillator or Buffered Clock - (See also
XTAL1). Crystal oscillator output or buffered clock output.
Symbol
Pin
Signal
Pin Description
type
SYMBOL DESCRIPTION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST68C554 | 制造商:EXAR 制造商全稱:EXAR 功能描述:QUAD UART WITH 16-BYTE FIFOS |
| ST68C554CJ68 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| ST68C554CJ68-F | 功能描述:UART 接口集成電路 SIGNALS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| ST68C554IJ68 | 制造商:Exar Corporation 功能描述: |
| ST68C554IJ68-F | 功能描述:UART 接口集成電路 SIGNALS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
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