sm59128 SyncMOS Technologies,Inc, sm59128 Datasheet - Page 11

• Manufacturer Part Number: sm59128
• Description: 8-bits Micro-controller Embedded 128kb Flash & 1kb Ram & Iic & Spwm
• Manufacturer: SyncMOS Technologies,Inc

The ports 1, 2 and 3 of standard 8051 have internal pull-up resistor, and port 0 has open-drain output. Each I/O pin can
be used independently as an input or an output. When an I/O port used as an input pin, the port bit latch must contain a
‘1’ to turn off the output driver FET. Port 1, 2 and 3 pins are pulled high by a weak internal pull-up, and can be pulled
low by an external source. The port 0 has open-drain output which means its pull-ups are not active during normal port
operation. Writing ‘1’ to the port 0 bit latch will cause bit floating so that it can be used as a high-impedance input.
The port 4 can be used as GPIO has the same function as port 1, 2 and 3.
2. Port 4 for PLCC or QFP package:
The bit addressable port 4 is available with PLCC or QFP package. The port 4 has only 4 pins and port address is
located at 0D8H. The function of port 4 is as same as port 1, port 2 and port 3.
Port4 (P4, $D8)
The bit 3, bit 2, bit 1, bit 0 out put the setting to pin P4.3, P4.2, P4.1, P4.0, respectively.
3. In-System Programming (ISP) Function
The SM59128 can generate flash control signals by internal hardware circuit. User is able to utilize flash control
register, flash address register and flash data register to execute the in-system programming (ISP) function without
removing the SM59128 from system board. The SM59128 provides internal flash control signals for users who would
like to perform on-line data update by utilizing ISP service program to execute the flash program/chip erase/page
erase/protect functions.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M027Ver: B SM59128
1.3 I/O Pin Configuration
Read / Write:
Reset value:
SyncMOS Technologies International, Inc.
Unused
bit-7
*
-
Unused
*
-
Unused
*
-
Unused
11
Embedded 128KB flash & 1KB RAM & IIC & SPWM
*
-
P4.3
R/W
1
P4.2
R/W
1
8-Bits Micro-controller
P4.1
R/W
1
SM59128
06/2009
P4.0
bit-0
R/W
1