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參數(shù)資料
| 型號(hào)： | EM6517 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 20/66頁(yè) |
| 文件大?。?/td> | 762K |
| 代理商： | EM6517 |
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EM6517
FOR ENGINEERING ONLY
EM Microelectronic-Marin SA, 09/99, Rev. A/277
20
7.6 Port C
The EM6517-1 has one globally configurable Input / Output port which is 4 bit wide (only two bits are available
for 24 pin packages). Input or output mode can be set by writing the bit
PCIOCntl
in
RegPCCntl
register.
“0“ = input mode (default), “1“ = output mode. The
RegPCData
register is used to write output data on port C.
Input data is read directly on the input terminal and put onto the internal data bus. It is not stored in the
RegPCData
register. The port C terminal status can be read on address
RegPCData
even in output mode. Be
aware that the data read on port C is not necessary of the same value as the data stored on
RegPCData
register.
At any reset, the
RegPCCntl
register is cleared, thus setting the port in input mode. During SLEEP mode,
PC[3:0] are in high impedance state.
The port C is globally configurable to act as CMOS or Nch. open drain port , selectable in
OPTPCandStr
register (
NchOpDPC
bit).
7.6.1 Pull-up or Pull-down
On each terminal of PC[3:0] an internal input pull-up (metal mask MPCPU[n]) or pull-down (metal mask
MPCPD[n]) resistor can be connected per metal mask option. Per default the two resistors are in place. In this
case one can chose per software to have either a pull-up, a pull-down or no resistor.
Figure 15. Port C Architecture
Open Drain Option
Register
Port C Direction Register
Port C Data Register
Internal Data Bus
Active
Pull-down
I / O Terminal
PC[n]
PCIOCntl
PCData[n]
DB[n]
Read
Read for PC[3:0]
Port C
Control
Active Pull-up
in Nch. Open
Drain Mode
Read
NoPdPC
Pull-down
Option Register
NchOpDPC
mask option
MPCPD[n]
Mask Option
MPCPD[n]
4
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