MAX1441GUP/V+ Maxim Integrated Products, MAX1441GUP/V+ Datasheet - Page 35

• Manufacturer Part Number: MAX1441GUP/V+
• Description: Touch Screen Converters & Controllers PROXIMITY SENSR el Proximity and Tou
• Manufacturer: Maxim Integrated Products

Specifications of MAX1441GUP/V+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The device supports interrupt through the Interrupt
Vector (IV) register and the Interrupt Control (IC) register.
The IV register allows the user program to set a preferred
vector location to any program memory address. The IV
register is fixed at 07FDh. Since the reset location can
also be at 0000h, the user program must take care of
any potential conflict between the reset and interrupt
vector function.
Interrupt sources can be classified into two categories:
• Asynchronous interrupt
• Synchronous interrupt
The device supports the following asynchronous inter-
rupts:
• External interrupts
• Watchdog interrupt
• Timer interrupts
• AFE interrupts
All the other internal interrupts are synchronous inter-
rupts. Synchronous internal interrupt is directly routed to
the interrupt handler that can be recognized in one cycle.
Figure 4. Clock Sources
Special System Functions
Automotive, Two-Channel Proximity and
OSCILLATOR
20MHz
Interrupt Sources
/4
5MHz
Interrupt
STOP
POR
CONTROLLER
/4
STARTUP
FLASH
TIMER
XDOG
All functional units in the device are synchronized
to the system clock that is generated from the 20MHz
oscillator. The basic unit of time in the device is the sys-
tem clock period. All storage logic blocks are triggered
by the rising edge of the system clock.
The internal clock circuitry generates the system clock
from an internal 5MHz, which is derived from the 20MHz
oscillator (Figure 4).
Each time-code execution must start or restart
(e.g., exiting stop mode), the following sequence occurs:
1) Remove clock gating of internal 5MHz.
2) Reset the warm-up counter.
3) Wait for Flash to power up (about 10Fs).
4) Allow the required warm-up delay of eight oscillator
The only time 20MHz turns off is if the CPU is in stop
mode and AFE is in standby mode or powered down (PD
register = 6). During stop mode, if the AFE is in standby
mode, the oscillator is periodically turned off and on to
allow the AFE to sample inputs. This causes an interrupt
to the CPU if an enabled threshold condition is met.
XDOG_DONE
1.25MHz
cycles of the 5MHz input.
RESET
STOP
POR
GENERATION
SYSTEM
CLOCK
SYSTEM
CLOCK
Touch Sensor
Clock Generation
Clock Sources
35