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參數(shù)資料
| 型號： | W741C250 |
| 英文描述： | 4-Bit Microcontroller |
| 中文描述： | 4位微控制器 |
| 文件頁數(shù)： | 17/88頁 |
| 文件大?。?/td> | 449K |
| 代理商： | W741C250 |
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W741C250
Publication Release Date: March 1998
- 17 -
Revision A4
EVF.3 Reserved
EVF.4 = 1 Falling edge signal on the
INT
pin occurred.
EVF.5 & EVF.6 are reserved.
EVF.7 = 1 Underflow from Timer 1 occurred.
Parameter Flag (PMF)
The parameter flag is organized as a 4-bit binary register (PMF.0 to PMF.3). The PMF is controlled
by the SET PMF, #I or CLR PMF, #I instruction. The bit descriptions are as follows:
W
0
1
2
3
PMF
Note: W means write only.
Bit 0, Bit1, Bit2
Reserved
Bit 3 = 0 The fundamental frequency of the watchdog timer is F
OSC
/1024.
= 1 The fundamental frequency of the watchdog timer is F
OSC
/16384.
Port Mode 0 Register (PM0)
The port mode 0 register is organized as a 4-bit binary register (PM0.0 to PM0.3). PM0 can be used
to determine the structure of the input/output ports; it is controlled by the MOV PM0, #I instruction.
The bit descriptions are as follows:
PM0
w
w
w
0
1
2
w
3
Note: W means write only.
Bit 0 = 0 RA port is CMOS output type.
Bit 0 = 1 RA port is NMOS open drain output type.
Bit 1 = 0 RB port is CMOS output type.
Bit 1 = 1 RB port is NMOS open drain output type.
Bit 2 = 0 RC port pull-high resistor is disabled.
Bit 2 = 1 RC port pull-high resistor is enabled.
Bit 3 = 0 RD port pull-high resistor is disabled.
Bit 3 = 1 RD port pull-high resistor is enabled.
Port Mode 1 Register (PM1)
The port mode 1 register is organized as a 4-bit binary register (PM1.0 to PM1.3). PM1 can be used
to control the input/output mode of port RA. PM1 is controlled by the MOV PM1, #I instruction. The bit
descriptions are as follows:
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