參數(shù)資料
型號： EPVP6200
廠商： ELAN Microelctronics Corp .
英文描述： VFD Controller
中文描述： 變頻控制器
文件頁數(shù)： 35/57頁
文件大?。?/td> 442K
代理商： EPVP6200
ePVP6200
VFD Controller
This specification is subject to change without further notice.
11.18.2004 (V1.53)
29 of 57
7.5 /O Port
The I/O registers are bi-directional tri-state I/O ports. The I/O ports can be defined as "input"
or "output" pins by the I/O control registers under program control. The I/O data registers and
I/O control registers are both readable and writable. The I/O interface circuit is shown in
Fig.22.
PCRD
M
U
X
0
1
PDRD
PDWR
CLK
C
L
P
R
D
Q
Q
CLK
C
L
P
R
D
Q
Q
PCWR
IOD
PORT
Fig. 8 The Circuit of I/O Port and I/O Control Register
7.6 RESET
A RESET can be caused by any of the following
:
1. Power on reset
2. WDT timeout (if enabled and in GREEN or NORMAL mode)
3. /RESET pin pull low
Once a RESET occurs, the following functions are performed.
The oscillator is running, or will be started.
The Program Counter (R2) is set to all "0".
When power on, the upper 3 bits of R3 and the upper 2 bits of R4 are cleared.
The Watchdog timer and prescaler counter are cleared.
The Watchdog timer is disabled.
The CONT register is set to all "1"
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