MC56F8037VLH

The MC56F8037VLH from NXP Semiconductors (formerly Freescale) is a 16-bit Digital Signal Controller (DSC) that combines digital signal processing and microcontroller functionalities on a single chip. It is based on the 56800E core, a dual Harvard-style architecture with three parallel execution units that can perform up to six operations per instruction cycle.

The 56800E core operates at 32 MHz, delivering 32 MIPS performance. It features a single-cycle 16×16-bit parallel MAC (Multiply-Accumulate), four 36-bit accumulators with extension bits, a 32-bit ALU with multi-bit shifter, hardware DO and REP loops, and parallel instruction set with unique DSP addressing modes. The MCU-style programming model and optimized instruction set support efficient C compiler output for rapid development.

Memory includes 64 KB (32K x 16) program Flash with page erase (512 bytes/page) and security/protection features, plus 8 KB (4K x 16) unified data/program RAM. The dual Harvard architecture allows up to three simultaneous memory accesses per instruction cycle. EEPROM emulation is possible using the Flash.

The 6-channel PWM module operates at up to 96 MHz clock with 15-bit resolution, supporting both center-aligned and edge-aligned modes. Four programmable fault inputs with digital filters provide protection. The PWM outputs can be sourced from the PWM generator, external GPIO, internal timers, analog comparators, or ADC limit comparisons.

Two independent 12-bit ADCs provide 2 x 8 channels with simultaneous and sequential conversion support, synchronized by PWM and timer modules at up to 2.67 MSPS. Two 12-bit DACs feature 2 us settling time and automatic waveform generation (square, triangle, sawtooth).

Communication peripherals include two QSCI (UART with LIN slave), two QSPI, one I2C (400 kbps), and one MSCAN (CAN 2.0A/B, up to 1 Mbps, 5 RX + 3 TX buffers). Two Quad Timer modules provide eight 16-bit counter/timers with 12 operating modes each.

The MC56F8037VLH includes 53 GPIO pins with 5 V tolerance, JTAG/OnCE debug interface, on-chip regulators, PLL, internal relaxation oscillator, and power management (Wait and Stop modes). The 64-LQFP package measures 10 x 10 mm.

Note: NXP designates the 56F803X family as “Not Recommended for New Designs” (NRND). The product is included in NXP’s product longevity program with assured supply for a minimum of 10 years after launch. Designers should consider the MC56F837xx or Kinetis KV series for new designs.

**56800E DSC Core:** The 56800E core uses a modified dual Harvard architecture with separate program and data memory buses, allowing up to three simultaneous memory accesses per instruction cycle. Three execution units operate in parallel: Data ALU, Address Generation Unit (AGU), and Program Controller. This enables up to six operations per instruction (1 data ALU, 2 address calculations, 2 data moves, 1 program control).

**MAC and Accumulators:** The 16×16-bit MAC performs single-cycle multiply-accumulate operations. Four 36-bit accumulators (with 4-bit extension) provide headroom for iterative calculations without overflow. The parallel instruction set supports MAC with parallel data moves, enabling efficient FIR/IIR filter implementation.

**Dual Harvard Memory:** Program memory (Flash) and data memory (RAM) are accessed through separate buses. The program bus fetches instructions (and optional data via program space), while the data bus reads/writes operands. This dual-bus architecture eliminates the Von Neumann bottleneck.

**PWM Module:** The 6-channel PWM module generates complementary PWM signals with programmable dead time, supporting 3-phase motor drive. The 96 MHz PWM clock provides 15-bit resolution at typical motor drive frequencies (e.g., 20 kHz PWM = 15-bit duty cycle resolution). The four fault inputs can immediately disable PWM outputs for overcurrent protection.

**ADC Synchronization:** The ADC modules can be synchronized to PWM reload events via the Quad Timer module, ensuring that current sensing occurs at the optimal point in the PWM cycle (typically at PWM center for minimum ripple). This hardware synchronization eliminates the need for software-timed ADC triggers.