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參數(shù)資料
| 型號(hào)： | EM6617VVVST11A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.032768 MHz, RISC MICROCONTROLLER |
| 封裝： | STICKY TAPE |
| 文件頁數(shù)： | 21/66頁 |
| 文件大?。?/td> | 759K |
| 代理商： | EM6617VVVST11A |
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EM6617-1
EM Microlectronic-Marin SA , 3/99 Rev. B/258
21
For Metal mask selection and available resistor values refer to chapter 19.1.3.
Pull-down ON
: MPCPD[n] must be in place ,
AND
bit
NoPdPC
[n] must be ‘0’ .
Pull-down OFF
: MPCPD[n] is not in place,
OR
if MPCPD[n] is in place
NoPdPC
[n] = ‘1’ cuts off the pull-down.
OR
selecting
NchOpDPC
[n] = ‘1’ cuts off the pull-down.
Pull-up ON
:
MPCPU[n] must be in place,
AND
bit
NchOpDPC
[n] must be ‘1’ ,
AND
(bit
PCIOCntl =
‘0’ (input mode)
OR
if
PBIOCntl
=
‘1’ while
PCData
[n] = 1. )
Pull-up OFF
: MPCPU[n] is not in place,
OR
if MPCPU[n] is in place
NchOpDPC
[n] = ‘0’ cuts off the pull-up,
OR
if MPCPU[n] is in place and if
NchOpDPC
[n] = ‘1’ then
PCData
[n] = 0 cuts the pull-up.
Never pull-up and pull-down can be active at the same time.
For
POWER SAVING
one can switch off the port C pull resistors between two read phases. No cross current
flows in the input amplifier while the port C 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 V
SS
or V
DD
.
Read the port C
Switch off the pull resistor
Minimum time with current on the pull resistor is 4 system clock periods, if the RC time constant is lower than 1
system clock period. Adding a NOP instruction before reading moves the number of periods with current in the
pull resistor to 6 and the maximum RC delay to 3 clock periods.
7.6.2 CMOS or Nch. Output
The port C outputs can be configured as either CMOS or Nch. open drain outputs. In CMOS both logic ‘1’ and
‘0’ are driven out on the terminal. In Nch. open drain only the logic ‘0’ is driven on the terminal, the logic ‘1’ value
is defined by the internal pull-up resistor (if implemented), or high impedance.
In CMOS output mode the pad can be driven high or low. Pull-ups and pull-downs are not active.
In CMOS input mode, if the corresponding metal option is in place (default), one can choose to have an internal
pull-down resistor by setting to “1“ the bit
NoPdPC
in
OPTPCandStr
register (default pull-down).
In N-Channel open drain mode, if the corresponding metal option is in place (default), one always has the pull-
up resistor active except if the port is in output mode and drives a "0" (RegPCCntl= "1", RegPBData[n]= "0") The
pull-down resistor is always off in Nch. open drain mode.
Pull-downs in CMOS input mode and weak pull-ups in Nch. open drain mode are port-wise configurable with the
register settings. The metal mask options to selectively connect or disconnect pull-up or pull-down resistors can
be different for each port C terminal.
7.7 Port C Registers
Table 7.7.1 Register RegPCData
Figure 16. CMOS or Nch. Open Drain Outputs
I / O
Term inal
PC[n]
M UX
Active Pull-up
for High State
PCData[n]
Tri-State O utput
Buffer : High
Im pedance for
Data = 1
I / O
Term inal
PC[n]
PCData[n]
Tri-State O utput
Buffer : closed
1
CM OS Output
Nch. Open Drain O utput
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