HT85F2260 Datasheet, PDF (118/226 Pages) Holtek Semiconductor Inc – Standard 8051 8-Bit Flash MCU

Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
26 ^{Input/Output Ports}
The devices offer a range of flexible options on their I/O ports. Many pins can be setup with a
choice of different register controlled modes as well as having pull-high wake up and slew rate
functions.
Input/Output Port Overview
The devices are provided with a series bidirectional input/output ports labeled with port names
P0~P5. These I/O ports are mapped to the Special Function Registers with specific addresses as
shown in the Special Function Registers table. All of these I/O ports can be used for both input and
output operations, the data for which is stored in Port Data Registers. Ports P0~P3 can be setup
using Port Mode Registers to operate in a series of different modes. Ports 4 and 5 can only operate
in the traditional 8051 type quasi-bidirectional mode. The Port P0 provides register controlled wake
up function as well. Bit manipulation instructions can be used to control Ports P0~P3, while Ports
4 and 5 must be controlled using byte wide instructions.
I/O Port Function Summary
Function.
Port Number
P0
P1
P2
P3
P4
P5
Notes
Push-Pull
√
√
√
√
—
— CMOS Output
Open Drain
√
√
√
√
—
— NMOS
Quasi Bi-direct
√
√
√
√
√
√ Traditional 8051 Port type
Input Only
√
√
√
√
—
— High impedance
Bit Addressable
√
√
√
√
—
—
—
Slew Rate Control
√
√
√
√
√
√ Fast or Slow select
Rev. 1.00
118 of 226
May 15, 2013