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參數(shù)資料
| 型號(hào)： | uPSD3251 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設(shè)備) |
| 中文描述： | 閃存可編程系統(tǒng)設(shè)備與8032微控制器內(nèi)核（帶8032微控制器內(nèi)核的閃存可編程系統(tǒng)設(shè)備） |
| 文件頁(yè)數(shù)： | 98/128頁(yè) |
| 文件大小： | 1566K |
| 代理商： | UPSD3251 |
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μPSD3251F
98/128
Drive Select Register.
The Drive Select Register
configures the pin driver as Open Drain or CMOS
for some port pins, and controls the slew rate for
the other port pins. An external pull-up resistor
should be used for pins configured as Open Drain.
A pin can be configured as Open Drain if its corre-
sponding bit in the Drive Select Register is set to a
'1.' The default pin drive is CMOS.
Note:
The slew rate is a measurement of the rise
and fall times of an output. A higher slew rate
means a faster output response and may create
more electrical noise. A pin operates in a high slew
rate when the corresponding bit in the Drive Reg-
ister is set to '1.' The default rate is slow slew.
Table 74, page 99 shows the Drive Register for
Ports B, C, and D. It summarizes which pins can
be configured as Open Drain outputs and which
pins the slew rate can be set for.
Table 70. Port Configuration Registers (PCR)
Note: 1. See Table 74 for Drive Register Bit definition.
Table 71. Port Pin Direction Control, Output
Enable P.T. Not Defined
Table 72. Port Pin Direction Control, Output
Enable P.T. Defined
Table 73. Port Direction Assignment Example
Register Name
Port
MCU Access
Control
B
WRITE/READ
Direction
B, C, D
WRITE/READ
Drive Select
(1)
B, C, D
WRITE/READ
Direction Register Bit
Port Pin Mode
0
Input
1
Output
Direction
Register Bit
Output Enable
P.T.
Port Pin Mode
0
0
Input
0
1
Output
1
0
Output
1
1
Output
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0
0
0
0
0
1
1
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| uPSD3251MEB | 制造商:P&S 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core 制造商:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core |
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| UPSD3253A-24T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253A-24T1T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253A-24T6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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