mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 201

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Chapter 11
FlexTimer Module (FTMV1)
11.1
The FTM is a six-channel timer which supports input capture, output compare and the generation of PWM
signals to control electric motor and power management applications. FTM time reference is a 16-bit
counter which can be used as an unsigned or signed counter. FTM target is 8-bit and 32-bit products (high
end S08 and ColdFire V1 families primarily). FTM is backwards compatible with the TPM for simple
configuration and operation and the high degree of reconfigurability at the design phase.
11.1.1
11.1.1.1
The FTM module supports up to three PWM hardware synchronization signal inputs that, when enabled,
update all buffered FTM registers after the rising edge of the trigger and optionally resets the FTM counter.
The synchronization trigger is enabled with the FTMxCOMBINEm[SYNCEN] bit and the trigger source
is selected in the FTMxSYNC register.
11.1.1.1.1
The ADCSC1[COCO] bit of the ADC module can be used as one of the three FTM hardware
synchronization triggers. This ADC input is the highest priority of the three hardware sync triggers.
Typical usage is to setup the ADC using the automatic compare function (ADCSC2[ACFE]=1). In this
configuration, the COCO bit is only set when the ADC result is either less than or greater than/equal to the
compare value.
11.1.1.1.2
The ACMPxSC[ACF] bit of the ACMPx modules can be used as one of the three FTM hardware
synchronization triggers. The ACMPx input is the second highest priority of the three hardware sync
triggers. ACMP1SC[ACF] is connected to FTM1 and ACMP2SC[ACF] is connected to FTM2.
The ACF bit can be configured to set on rising voltage inputs, falling voltage inputs or both rising and
falling inputs.
11.1.1.1.3
The TPM3CHn output of the TPM3 module can be used as one of the three FTM hardware synchronization
triggers. TPM3CH0 is connected to FTM1 and TPM3CH1 is connected to FTM2.
Freescale Semiconductor
Introduction
FTM Module-to-Module Interconnects
FTMx Synchronization Triggers
ADC to FTMx Synchronization triggers
ACMPx to FTMx Synchronization Trigger
TPM3 to FTMx Synchronization triggers
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
11-1