W742E Datasheet, PDF (33/60 Pages) Winbond – 4 BIT MICROCONTROLLER

W742E/C811
DATA
BUS
Input/Output Pin of the RA(RB)
PM0.0(PM0.1)
Output
Buffer
Enable
PM1.n (PM2.n)
MOV RA,R(MOV RB,R)
instruction
Enable
MOVA R,RA(MOVA R,RB) instruction
Figure 5-10 Architecture of RA (RB) Input/Output Pins
I/O PIN
RA.n(RB.n)
Input/Output Pin of the P0
DATA
BUS
Output
Buffer
Enable
PM6.n
MOV P0,R instruction
I/O PIN
P0.n
Enable
MOVA R,P0 instruction
Figure 5-11 Architecture of P0 Input/Output pins
5.18.1 Port Mode 0 Register (PM0)
The port mode 0 register is organized as 4-bit binary register (PM0.0 to PM0.3). PM0 can be used to
determine the port structure; it is controlled by the MOV PM0, #I instruction. The bit description is as
follows:
3210
PM0 w w w w
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.
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Publication Release Date: December 2000
Revision A1