mpc5645s Freescale Semiconductor, Inc, mpc5645s Datasheet - Page 21

• Manufacturer Part Number: mpc5645s
• Description: Mpc5645s Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

1.3.29
The STM is a 32-bit timer designed to support commonly required system and application software timing functions. The STM
includes a 32-bit up counter and four 32-bit compare channels with a separate interrupt source for each channel. The counter is
driven by the system clock divided by an 8-bit prescale value (1 to 256).
1.3.30
The SWT features the following:
1.3.31
The SMC module is a PWM motor controller suitable to drive instruments in a cluster configuration or any other loads requiring
a PWM signal. The motor controller has twelve PWM channels associated with two pins each (24 pins in total) driving up to 6
stepper motors.
The SMC module includes the following features:
This module is suited for, but not limited to, driving small stepper and air core motors used in instrumentation applications. This
module can be used for other motor control or PWM applications that match the frequency, resolution, and output drive
capabilities of the module.
1.3.32
The SSD module provides a circuit to measure and integrate the induced voltage on the non-driven coil of a stepper motor using
full steps when the gauge pointer is returning to zero (RTZ).
The SSD module features the following:
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Selectable clock sources from external 32 KHz crystal, external 4–16 MHz crystal, internal 128 kHz RC oscillator or
divided internal 16 MHz RC oscillator
One 32-bit up counter with 8-bit prescaler
Four 32-bit compare channels
Independent interrupt source for each channel
Counter can be stopped in debug mode
Watchdog supporting software activation or enabled out of Reset
Supports normal or windowed mode
Watchdog timer value writable once after reset
Watchdog supports optional halting during low power modes
Configurable response on timeout: reset, interrupt, or interrupt followed by reset
Clock source: 128 kHz RC oscillator
10/11-bit PWM counter
11-bit resolution with selectable PWM dithering function
Left, right, or center aligned PWM
Output slew rate control
Output Short Circuit Detection
Programmable full step state
Programmable integration polarity
Blanking (recirculation) state
16-bit integration accumulator register
System Timer Module (STM)
Software Watchdog Timer (SWT)
Stepper Motor Controller (SMC)
Stepper Stall Detect (SSD)
MPC5645S Microcontroller Data Sheet, Rev. 6
Overview
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