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參數(shù)資料
| 型號： | Z8913820FSC |
| 廠商： | ZILOG INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 8-BIT, 20.48 MHz, MIXED DSP, PQFP100 |
| 封裝： | QFP-100 |
| 文件頁數(shù)： | 18/65頁 |
| 文件大?。?/td> | 2054K |
| 代理商： | Z8913820FSC |
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Z89138/Z89139
Zilog
Voice Processing Controllers
DS97TAD0201
P R E L I M I N A R Y
25
1
Port 2 (P27-P20). Port 2 is an 8-bit, bidirectional, CMOS
compatible I/O port. These eight I/O lines are configured
under software control independently as inputs or outputs.
Port 2 is always available for I/O operation. The input buff-
ers are Schmitt-triggered. Bits programmed as outputs can
be globally programmed as either push-pull or open-drain.
Port 2 can be placed under handshake control. In this con-
figuration, Port 3 lines P31 and P36 are used as the hand-
shake controls lines /DAV2 and RDY2. The handshake
signal assignment for Port 3 lines P31 and P36 is dictated
by the direction (input or output) assigned to bit 7, Port 2
(Figure 13).
The Auto Latch on Port 2 puts valid CMOS levels on all
CMOS inputs which are not externally driven. Whether this
level is 0 or 1, cannot be determined. A valid CMOS level,
rather than a floating node, reduces excessive supply cur-
rent flow in the input buffer.
Figure 13. Port 2 Conguration
OEN
Out
In
Pad
Auto Latch
Port 2
(I/O)
Handshake Controls
/DAV2 and RDY2
(P31 and P36)
Z89138/139
MCU
R = 500 K
1.5
2.3V Hysteresis
Open-Drain
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Z8913829ASC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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| Z89139 | 制造商:ZILOG 制造商全稱:ZILOG 功能描述:Voice Processing Controllers |
| Z8913920ASC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| Z8913920FSC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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