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参数资料
| 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： | 15/62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
22
www.emmicroelectronic.com
6.6 PortC
PortC has the same features as the PortB but instead of being used to outputs frequencies, it can be used to
output Serial Write Buffer (SWB) signals.
6.6.1 Input / Output Mode
Each PortC terminal can be either input or output. These modes can be set by writing the corresponding bit in the
RegPCCntl control register. The RegPCData register contains the data written to the PortC terminal in output
mode. To set for input (default), 0 is written to the corresponding bit of the RegPCCntl 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 RegPCData register. The PortC terminal
status can be read in any mode (read at address of RegPCData).
During SLEEP and Reset mode, PC[3:0] is in high impedance state with no pulls up/down active. Except during a
read phase on PortC (in active mode), all the PortC inputs are cut off (blocked).
6.6.2 Pull-up/Down
For each terminal of PC[3:0] an input pull-up (metal mask MPCPU[n]) or pull-down (metal mask MPCPD[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 ‘PortC Metal Options’.
Pulldown ON : MPCPD[n] must be in place ,
AND the bit NoPdPC[n] must be ‘0’ .
Pulldown OFF : MPBPD[n] is not in place,
OR if MPCPD[n] is in place NoPdPC[n] = ‘1’ cuts off the pulldown.
OR seletcing NchOpDPC[n] = ‘1’ cuts off the pulldown.
Pullup ON
: MPCPU[n] must be in place,
AND the bit NchOpDPC[n] must be ‘1’ ,
AND the bit PCIOCntl[n] = ‘0’ (input mode) OR if PCIOCntl[n] = ‘1’ while PCData[n] = 1.
Pullup OFF
: MPCPU[n] is not in place,
OR if MPCPU[n] is in place NchOpDPC[n] = ‘0’ cuts off the pullup,
OR if MPCPU[n] is in place and if NchOpDPC[n] = ‘1’ then PCData[n] = 0 cuts off the pullup.
Never can pull-up and pull-down be active at the same time.
For POWER SAVING one can switch off the PortC pull resistors between two read phases. No cross current
flows in the input amplifier while the PortC is not read. The recommended order is :
switch on the pull resistor.
allow sufficient time - RC constant - for the pull resistor to drive the line to either VSS or VDD.
Read the PortC
Switch off the pull resistor
Minimum time with current on the pull resistor is 4 periods of the system clock, if the RC constant is lower than 1
system clock period. Adding a NOP before reading moves the number of periods with current in the pull resistor
to 6 and the maximum RC delay to 3 clock periods.
相关PDF资料 |
PDF描述 |
|---|---|
| EM6640SO18B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM6640TP16A | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM6640TP16B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-SOIC |
| EM6821TQ52B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC |
| EM6821TQ52D | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
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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