MAXQ2000-RAX Maxim Integrated Products, MAXQ2000-RAX Datasheet - Page 28

• Manufacturer Part Number: MAXQ2000-RAX
• Description: Microcontrollers (MCU) Low-Power LCD MCU
• Manufacturer: Maxim Integrated Products

Specifications of MAXQ2000-RAX

• Processor Series: MAXQ2000
• Core: RISC
• Data Bus Width: 16 bit
• Program Memory Type: Flash
• Program Memory Size: 64 KB
• Data Ram Size: 2 KB
• Interface Type: 1-Wire, SPI, JTAG, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 50
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 2.75 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-68
• Development Tools By Supplier: MAXQ2000-KIT
• Minimum Operating Temperature: - 40 C

Low-Power LCD Microcontroller
An internal power-on reset circuit enhances system reli-
ability. This circuit forces the device to perform a
power-on reset whenever a rising voltage on V
climbs above approximately 1.8V. At this point the fol-
lowing events occur:
• All registers and circuits enter their reset state
• The POR flag (WDCN.7) is set to indicate the source
• The ring oscillator becomes the clock source and
• Code execution begins at location 8000h
The watchdog timer functions are described in the
MAXQ Family User’s Guide . Execution resumes at loca-
tion 8000h following a watchdog timer reset.
Asserting the external RESET pin low causes the device
to enter the reset state. The external reset functions as
described in the MAXQ Family User’s Guide . Execution
resumes at location 8000h after the RESET pin is
released.
Figure 3. Type-C/D Port Pin Schematic
28
of the reset
____________________________________________________________________
PI.x OR SF INPUT
SF DIRECTION
FLAG
SF OUTPUT
SF ENABLE
PD.x
PO.x
Watchdog Timer Reset
External System Reset
INTERRUPT
FLAG
Power-On Reset
CIRCUIT
DETECT
EIES.x
DDIO
TYPE-D PORT ONLY
The microcontroller uses the type C and type D bidirec-
tional I/O ports described in the MAXQ Family User’s
Guide . The use of three port types allows for maximum
flexibility when interfacing to external peripherals. Each
port has eight independent, general-purpose I/O pins
and three configure/control registers. Many pins support
alternate functions such as timers or interrupts, which are
enabled, controlled, and monitored by dedicated periph-
eral registers. Using the alternate function automatically
converts the pin to that function.
Type-C port pins have Schmitt Trigger receivers and
full CMOS output drivers, and can support alternate
functions. The pin is either tri-stated or weak pullup
when defined as an input, dependent on the state of
the corresponding bit in the output register.
Type-D port pins have Schmitt Trigger receivers and
full CMOS output drivers, and can support alternate
functions. The pin is either tri-stated or weak pullup
when defined as an input, dependent on the state of
the corresponding bit in the output register. All type-D
pins also have interrupt capability.
MAXQ2000
I/O PAD
V
DDIO
V
WEAK
DDIO
PIN.x
I/O Ports