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| 型号： | EM6640SO18B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| 中文描述： | 微控制器 |
| 文件页数： | 9/62页 |
| 文件大小： | 620K |
| 代理商： | EM6640SO18B |
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EM6640
03/02 REV. C/446
Copyright
2002, EM Microelectronic-Marin SA
17
www.emmicroelectronic.com
6.2.2 Pull-up/down
Each of the input port terminals PA[3:0] has a resistor integrated which can be used either as pull-up or pull-down
resistor, depending on the selected metal mask options. See Table 6.2.1 and the PortA metal mask chapter for
details. The pull resistor can be inhibited using the NoPullPA[n] bits in the register OptNoPullPA.
Table 6.2.1 Pull-up or pull-down resistor on PortA select
opt mask pull-up
MPAPU[n]
opt mask pull-down
MPAPD[n]
NoPullPA[n] value
Action
with
n=0...3
no
x
no pull-up, no pull-down
no
yes
0
no pull-up, pull-down
no
yes
1
no pull-up, no pull-down
yes
no
0
pull-up, no pull-down
yes
no
1
no pull-up , no pull-down
yes
x
not allowed*
* only pullup or pulldown may be chosen on any PortA terminal (one choice is excluding the other)
Any PortA input must never be left open (high impedance state, not connected, etc. ) unless the internal pull
resistor is in place (mask option) and switched on (register selection). Any open input may draw a significant cross
current which adds to the total chip consumption.
6.2.3 Software test variables
The PortA terminals PA[3:0] are also used as input conditions for conditional software branches. Independent of
the OPtDebIntPA and the OPTIntEdgPA these CPU inputs are always debounced and non-inverted.
- debounced PA[0] is connected to CPU TestVar1
- debounced PA[1] is connected to CPU TestVar2
6.2.4 PortA for 10-bit Counter
The PA[0] and PA[3] inputs can be used as the clock input terminal for the 10 bit counter in "event count" mode.
As for the IRQ generation one can choose debounced or direct input with the register OPtDebIntPA and non-
inverted or inverted input with the register OPTIntEdgPA. Debouncer input is recommended when using PA[3] or
PA[0] for the event counting.
6.2.5 PortA for serial write buffer (SWB)
The PA[0] can be used as the external clock input terminal for the SWB in automatic mode. Depending of the
register RegSWBCntl2 contents, this external clock can be divided by 1/1, 1/4, 1/88 or 1/352.
As for the IRQ generation one can choose debounced or direct input with the register OPtDebIntPA and non-
inverted or inverted input with the register OPTIntEdgPA.
6.3 PortA registers
Table 6.3.1 register RegPA
Bit
Name
Reset
R/W
Description
3
PAData[3]
-
R
PA[3] input status
2
PAData[2]
-
R
PA[2] input status
1
PAData[1]
-
R
PA[1] input status
0
PAData[0]
-
R
PA[0] input status
direct read on pin
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