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參數資料
型號: W741L260
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT MICROCONTROLLER
中文描述: 4-BIT, MROM, 1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 21/90頁
文件大小: 480K
代理商: W741L260
W741L260
Publication Release Date: March 1998
- 21 -
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 0 = 1 RB.0 works as input pin
Bit 1 = 0 RB.1 works as output pin; Bit 1 = 1 RB.1 works as input pin
Bit 2 = 0 RB.2 works as output pin; Bit 2 = 1 RB.2 works as input pin
Bit 3 = 0 RB.3 works as output pin; Bit 3 = 1 RB.3 works as input pin
At initial reset, the port RB is input mode (PM2 = 1111B).
Reset Function
The W741L260 is reset either by a power-on reset or by using the external
RES
pin. The initial state
of the W741L260 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 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
Disable
F
OSC
/1024
OFF
LCD drive output
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