st2064b Sitronix Technology Corporation, st2064b Datasheet - Page 17

• Manufacturer Part Number: st2064b
• Description: 8 Bit Microcontroller With 64k Bytes Rom
• Manufacturer: Sitronix Technology Corporation

10.3.3 PORT-B and PORT-C PULL-UP OPTION
Port-B/C contains PMOS transistors of pull-up resistor
controlled by software in bit-manner. In case of input
direction, on/off of the pull-up PMOS transistor is
controlled by the data wrote to data register, PB/PC. “ 1”
is for enable and “ 0” is for disable. Above all, whole
pull-up control is by PULL bit of PMCR. Refer to
FIGURE 10-4 for the block description.
Ver. 3.0
Address Name
$00F
Bit 7: PULL : Enable all pull-up functions bit
PMCR
1 = Enable pull-up function
0 = Disable pull-up function
R/W
R/W
PULL
Bit 7
PDBN
Bit 6
TABLE 10-10 Port Control Register (PMCR)
INTEG
Bit 5
17/57
Bit 4
PULL-UP
-
PORT
CONTROL
REGISTER
( PCR )
PORT
DATA
REGISTER
( PDR )
FIGURE 10-4 Port-B and Port-C Block Diagram
TEST
Bit 3
DATA INPUT
Bit 2
-
Bit 1
RD_INPUT
-
VCC
PULL-UP
Bit 0
PMOS
-
100 - - - - -
Default
ST2064B
5/8/09