BS85B12-3 HOLTEK [Holtek Semiconductor Inc], BS85B12-3 Datasheet - Page 55

Manufacturer Part Number

BS85B12-3

Description

Touch Key Flash Type 8-Bit MCU with LCD/LED Driver

Manufacturer

HOLTEK [Holtek Semiconductor Inc]

Datasheet

1.BS85B12-3.pdf (182 pages)

BS85B12-3/BS85C20-3

Touch Key Flash MCU with LCD/LED Driver

Input/Output Ports

Rev. 1.00

PAWU

Name

PAPU

PBPU

PCPU

PAC

PBC

PCC

I/O Register List

BS85B12-3

Holtek microcontrollers offer considerable flexibility on their I/O ports. With the input or output

designation of every pin fully under user program control, pull-high selections for all ports and

wake-up selections on certain pins, the user is provided with an I/O structure to meet the needs of a

wide range of application possibilities.

The device provides bidirectional input/output lines labeled with port names PA~PE. These I/O ports

are mapped to the RAM Data Memory with specific addresses as shown in the Special Purpose Data

Memory table. All of these I/O ports can be used for input and output operations. For input operation,

these ports are non-latching, which means the inputs must be ready at the T2 rising edge of instruction

remains unchanged until the output latch is rewritten.

MOV A,[m] , where m denotes the port address. For output operation, all the data is latched and

Bit

February 1, 2011