st2601b Sitronix Technology Corporation, st2601b Datasheet - Page 2

• Manufacturer Part Number: st2601b
• Description: 8-bit Integrated Microcontroller
• Manufacturer: Sitronix Technology Corporation

1
The ST2601B is a 8-bit integrated microcontroller designed
with CMOS silicon gate technology. The true static CPU core,
power down modes and dual oscillators design makes the
ST2601B suitable for power saving and long battery life
designs. The ST2601B integrates various logic to support
functions on-chip which are needed by system designers.
The ST2601B features the capacity of memory access of
maximum 44M bytes and DMA function for fast memory
transfer. Six chip-select pins are equipped for direct connection
to external ROM, SRAM, Flash memory or other devices. The
maximum size for a single external memory device can be 16M
bytes.
The ST2601B has 39 I/Os grouped into 5 ports. They are
Port-C, Port-D, Port-E (7 pins), Port-F and Port-L, where the
Port-F consists of 8 open-drain output pins shared with LCD
COMs. Each I/O pins can be programmed to input or output
individually. Port-C input pins provide both pull-up and
pull-down options. The other input pins only support the pull-up
option. In the case of output mode, Port-C output pins have
open-drain type and CMOS type options; while the other ports
are fixed at CMOS type. The Port-C/D/E/F/L are shared with
other system functions. All the properties of the I/O pins are still
programmable when they are configured as other special
functional signals. This enlarges the flexibility of the usage of
the functional signals.
The ability of driving large LCD panels, up to 100X100in BW
mode, and hardware gray-level support may enrich the display
information and the diversify the display contents as well. By
the patented sharing mechanism design of internal memory,
the LCD display function can be done without the need of
external display RAM. The variable LCD buffer design also
makes it feasible to use small internal display RAM as the
buffer of large-sized display. User may free major internal RAM
for computing or temporary access while keeping the display
content. The clock of LCD (LCDCK) is not only sourced from
GENERAL DESCRIPTION
2/35
main-frequency (OSC), it can also be sourced by OSCX
(32KHz crystal) to make current consumption to be minimum.
Besides, Vlcd has excellent voltage variation when Vdd
changes from 2.4V to 3.6V. Further more, ST2601B has inside
trimming fuse function for Vlcd and LVD.So every ST2601B
real-chip will have almost the same default Vlcd and LVD
voltage.
The ST2601B equips 2 serial communication ports, one UART
port and one SPI port, to perform different communications, ex.:
RS-232 and IrDA, with system components or other products
such as PC, Notebook, and popular PDA. Three clocking
outputs can produce synthesized PWM signals or high
frequency carrier for IR remote control. This helps products
become more useful in our daily life.
The built-in four-channel PSG are designed to generate key
tone, melody, voice, and speech. Two dedicated pins with large
driving capacity can drive a buzzer/speaker directly.
The ST2601B has a Low Voltage Detector (LVD) for power
management usage. The status of internal or external power
can be detected and reported to the management software.
Power bouncing during power-on is a major problem when
designing a reliable system. The ST2601B equips a Low
Voltage Reset function to keep the whole system in reset status
when power is low. After the power returns to normal level, the
system may recover its original states and keeps working
correctly.
With these integrated functions inside, the ST2601B single chip
microcontroller is a right solution for PDA, translator, databank
and other consumer products.
The block diagram of ST2601B is shown in the following figure.
ST2601B