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參數(shù)資料
型號(hào): W7411250
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-BIT Microcontroller(4位的微控制器)
中文描述: 4位微控制器(第4位的微控制器)
文件頁(yè)數(shù): 19/86頁(yè)
文件大小: 478K
代理商: W7411250
W741L250
Publication Release Date: March 1998
- 19 -
Revision A2
Port Mode 2 Register (PM2)
The port mode 2 register is organized as a 4-bit binary register (PM2.0 to PM2.3). PM2 can be used
to control the input/output mode of port RB. PM2 is controlled by the MOV PM2, #I instruction. The bit
descriptions are as follows:
PM2
w
w
w
0
1
2
w
3
Note: W means write only.
Bit 0 = 0 RB.0 works as output pin.
Bit 1 = 0 RB.1 works as output pin.
Bit 2 = 0 RB.2 works as output pin.
Bit 3 = 0 RB.3 works as output pin.
After initial reset, port RB is in input mode (PM2 = 1111B).
Bit 0 = 1 RB.0 works as input pin.
Bit 1 = 1 RB.1 works as input pin.
Bit 2 = 1 RB.2 works as input pin.
Bit 3 = 1 RB.3 works as input pin.
Reset Function
The W741L250 is reset either by a power-on reset or by using the external
RES
pin. The initial state
of the W741L250 after the reset function is executed is described below.
Program Counter (PC)
TM0, TM1
MR0, MR1, PM0, PAGE, PMF registers
PM1, PM2 registers
PSR0 register
IEF, HEF, HCF, PEF, EVF, SEF flags
Timer 0 input clock
Timer 1 input clock
MFP output
Input/output ports RA, RB
Output port RE
RA & RB ports output type
RC & RD ports pull-high resistors
Input clock of the watchdog timer
LCD display
Segment output mode
000H
Reset
Reset
Set (1111B)
Reset
Reset
F
OSC
/4
F
OSC
Low
Input mode
High
CMOS type
Disabled
F
OSC
/1024
OFF
LCD drive output
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