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| 型号： | EM6640SO18A |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| 中文描述： | 微控制器 |
| 文件页数： | 11/62页 |
| 文件大小： | 620K |
| 代理商： | EM6640SO18A |
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EM6640
03/02 REV. C/446
Copyright
2002, EM Microelectronic-Marin SA
19
www.emmicroelectronic.com
6.4 PortB
The EM6640 has two four bit general purpose I/O ports: PortB and PortC. Each bit can be configured individually
(bitwise port) by software for input/output, pull-up, pull-down, CMOS/Nchannel Open Drain output, Frequency or
PWM output. The PortB has two high current output pads: PB[2:1].
6.4.1 Input / Output Mode
Each PortB terminal can be either input or output. These modes can be set by writing the corresponding bit in the
RegPBCntl control register. The RegPBData register contains the data written to the PortB terminal in output
mode. To set for input (default), 0 is written to the corresponding bit of the RegPBCntl register which results in a
high impedance state for the output driver. The output mode is set by writing 1 in the control register, and
consequently the output terminal follows the status of the bits in the RegPBData register. The PortB terminal
status can be read in any mode (read at address of RegPBData).
During SLEEP and Reset mode, PB[3:0] is in high impedance state with no pulls up/down active. Except during a
read phase on PortB (in active mode), all the PortB inputs are cut off (blocked).
6.4.2 Pull-up/Down
For each terminal of PB[3:0] an input pull-up (metal mask MPBPU[n]) or pull-down (metal mask MPBPD[n])
resistor can be implemented per metal mask option. Per default the two metal masks are in place, so one can
chose per software to have either a pull-up, a pull-down or no resistor.
For Metal mask selection and available resistor values refer to chapter ‘PortB Metal Options’.
Pulldown ON : MPBPD[n] must be in place ,
AND the bit NoPdPB[n] must be ‘0’ .
Pulldown OFF : MPBPD[n] is not in place,
OR if MPBPD[n] is in place NoPdPB[n] = ‘1’ cuts off the pulldown.
OR selecting NchOpDPB[n] = ‘1’ cuts off the pulldown.
Figure 15. PortB architecture
P o rtB dire c tion R e g
P o rtB data R e g
In te rn a l D a ta B u s
MU X
Ac tiv e
P u lldow n
I / O T e rm in a l
PB[n ]
DDR[n ]
DR[n ]
DB [n ]
RD
nR D P B [3:0]
S leep
M u ltip le x e d
O u tput
M u ltip le x e d
O u tp u t A c tiv e
M u ltip le x e d
O u tputs are:
P W M , C K [20],
C K [1 6 ], C K [1 2 ]
Po rt B
C ontro l
Ac tiv e Pu llu p if
Op e n D r a in
M ode
SL EEP
Pd [n ]
P u lldow n
O p tion R egis ter
OD [n ]
O pen D rain
O p tion R egis ter
m a s k optio n
M PBPD [n ]
m a s k optio n
M PBPD [n ]
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| EM6640SO18B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EM6640SO18B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640TP16A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640TP16B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640WP11 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Low Power Microcontroller with EEPROM AND RC Oscillator |
| EM6640WP27 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Low Power Microcontroller with EEPROM AND RC Oscillator |
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