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參數資料
型號: W741C250
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT Microcontroller(多次可編程4位的微控制器)
中文描述: 4-BIT, MROM, 4.19 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 20 MM, QFP-64
文件頁數: 18/88頁
文件大小: 496K
代理商: W741C250
W741C250
- 18 -
PM1
w
w
w
0
1
2
w
3
Note: W means write only.
Bit 0 = 0 RA.0 works as output pin.
Bit 1 = 0 RA.1 works as output pin.
Bit 2 = 0 RA.2 works as output pin.
Bit 3 = 0 RA.3 works as output pin.
Bit 0 = 1 RA.0 works as input pin.
Bit 1 = 1 RA.1 works as input pin.
Bit 2 = 1 RA.2 works as input pin.
Bit 3 = 1 RA.3 works as input pin.
After initial reset, port RA is in input mode (PM1 = 1111B).
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 W741C250 is reset either by a power-on reset or by using the external
RES
pin. The initial state
of the W741C250 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
000H
Reset
Reset
Set (1111B)
Reset
Reset
F
OSC
/4
F
OSC
Low
Input mode
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相關代理商/技術參數
參數描述
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