MAX32630 datasheet(21/27 Pages) MAXIM

21 / 27 page

Real-Time Clock and Wake-Up Timer

A real-time clock (RTC) keeps the time of day in absolute

seconds. The 32-bit seconds register can count up to

approximately 136 years and be translated to calendar

format by application software. A time-of-day alarm and

independent subsecond alarm can cause an interrupt or

wake the device from stop mode. The minimum wake-up

interval is 244μs. The VRTC supports SRAM retention in

power mode LP0.

CRC Module

A CRC hardware module is included to provide fast calcu-

lations and data integrity checks by application software.

The CRC module supports both the CRC-16-CCITT and

CRC-32 (X32 + X26 + X23 + X22 + X16 + X12 + X11 + X10

+ X8 + X7 + X5 + X4 + X2 + X + 1) polynomials.

Watchdog Timers

Two independent watchdog timers (WDT1 and WDT2)

with window support are provided. The watchdog timers

are independent and have multiple clock source options

to ensure system security. The watchdog uses a 32-bit

timer with prescaler to generate the watchdog reset. When

enabled, the watchdog timers must be written prior to time-

out or within a window of time if window mode is enabled.

Failure to write the watchdog timer during the programmed

timing window results in a watchdog timeout. The WDT1

or WDT2 flags are set on reset if a watchdog expiration

caused the system reset. The clock source options for the

watchdog timers WDT1 and WDT2 include:

● Scaled system clock

● Real-time clock

● Power management clock

A third watchdog timer (WDT3) is provided for recovery

from runaway code or system unresponsiveness. This

recovery watchdog uses a 16-bit timer to generate the

watchdog reset. When enabled, this watchdog must be

written prior to timeout, resulting in a watchdog timeout.

The WDT3 flag is set on reset if a watchdog expiration

caused the system reset. The clock source for the recov-

ery watchdog is the 8kHz nano ring, and the granularity

of the timeout period is intended only for system recovery.

Programmable Timers

Six 32-bit timers provide timing, capture/compare, or gen-

eration of pulse-width modulated (PWM) signals. Each of

the 32-bit timers can also be split into two 16-bit timers,

enabling 12 standard 16-bit timers.

32-bit timer features:

● 32-bit up/down autoreload

● Programmable 16-bit prescaler

● PWM output generation

● Capture, compare, and capture/compare capability

● GPIOs can be assigned as external timer inputs,

clock gating or capture, limited to an input frequency

of 1/4 of the peripheral clock frequency

● Timer output pin

● Configurable as 2x 16-bit general purpose timers

● Timer interrupt

Figure 4. Timer Block Diagram, 32-Bit Mode

TIMER CONTROL

32-BIT TIMER

(WITH PRESCALER)

32-BIT COMPARE

32-BIT

PWM/COMPARE

COMPARE

INTERRUPT

PWM AND TIMER

OUTPUT

CONTROL

TIME INTERRUPT

APB

BUS

APB

CLOCK

TIMER

INTERRUPT

TIMER

OUTPUT

TIMER

INPUT

32-BIT TIMER BLOCK

www.maximintegrated.com

Maxim Integrated │ 21

MAX32630/MAX32631

Ultra-Low Power, High-Performance

Cortex-M4F Microcontroller for Wearables

MAX32630 Datasheet(PDF) 21 Page - Maxim Integrated Products

MAX32630 Datasheet(HTML) 21 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Datasheet Download

Link URL