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參數(shù)資料
| 型號： | 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)： | 17/66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
17
7.4 Port B
The EM6617-1 has one four bit general purpose I/O port. Each bit can be configured individually by software for
input/output, pull-up, pull-down and CMOS or Nch. open drain output type. The port outputs either data,
frequency or PWM signals.
7.4.1 Input / Output Mode
Each port B terminal is bit-wise bi-directional. The input or output mode on each port B terminal is set by writing
the corresponding bit in the
RegPBCntl
control register. 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 port B terminal status can be read on address
RegPBData
even in output mode. Be aware that the data
read on port B is not necessary of the same value as the data stored on
RegPBData
register.
See also Figure 13 for details.
Figure 13. Port B Architecture
Open Drain Option
Register
Port B Direction Register
Port B Data Register
Internal Data Bus
MUX
Active
Pull-down
I / O Terminal
PB[n]
PBIOCntl[n]
PBData[n]
DB[n]
Read
Read for PB[3:0]
Multiplexed
Output
Multiplexed
Output Active
Multiplexed
Outputs are:
PWM, Ck[11],
Ck[16], Ck[12]
Port B
Control
Active Pull-up
in Nch. Open
Drain Mode
Read
NoPdPB[n]
Pull-down
Option Register
NchOpDPB[n]
mask option
MPBPD[n]
Mask Option
MPBPD[n]
4
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