Texas Instruments TMS370C777ANMT

Overview

TMS370C777ANMT from Texas Instruments is an 8-bit OTP EPROM microcontroller with 24 KB program memory, 512-byte RAM, 256-byte data EEPROM, and integrated 8-channel 8-bit ADC1 - designed for automotive and industrial motor control where reprogrammability without windowed packaging is required.

For engineers reviewing the TMS370C777ANMT datasheet, TMS370C777ANMT pinout, TMS370C777ANMT application, or TMS370C777ANMT equivalent, key selection criteria include its 64-pin SDIP package, divide-by-4/divide-by-1 clock options (0.5–5 MHz SYSCLK), STANDBY/HALT low-power modes, and register-to-register architecture supporting 256 general-purpose registers and 14 addressing modes.

Technical Context

The TMS370C777ANMT implements a register-to-register CPU architecture eliminating accumulator bottlenecks, enabling direct arithmetic operations like ADD R24,R47. Its memory map unifies program and data spaces (Von Neumann), with 512-byte RAM (0000h–01FFh), 24 KB EPROM (2000h–7FFFh), and 256-byte EEPROM (1F00h–1FFFh) all accessible via peripheral file addresses 1000h–10FFh.

Peripheral integration includes two 16-bit timers (Timer1 with 8-bit prescaler, Timer2A), a 24-bit watchdog timer, and ADC1 with eight analog inputs (AN0–AN7) mapped to Port E pins. All I/O ports (A–G, D) are software-configurable bidirectional pins, with dedicated functions such as T1PWM, T2AIC2/PWM, and RESET with open-drain output capability for fault indication.

Key Specifications

Pinout & Package

Package: 64-pin plastic shrink dual-in-line (SDIP), FN/NM suffix - suitable for through-hole prototyping and industrial PCB assembly with verified thermal and mechanical reliability across commercial/industrial temperature ranges.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with TMS370C077ANMT, the TMS370C777ANMT trades mask-ROM permanence for field-programmable flexibility, while SE370C777JN offers greater development agility at the expense of production-grade endurance and packaging robustness.

Availability

TMS370C777ANMT is available at Aetrix Electronics and suitable for automotive body control, industrial motor drives, and telecom line card supervision requiring stable component supply across extended product lifecycles.

Supply support for TMS370C777ANMT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 50 years of microcontroller innovation.

The TMS370Cx7x product line was engineered for cost-effective real-time control in harsh environments - integrating memory, ADC, timers, and low-power modes into a single chip for automotive, industrial, and telecom applications.

FAQ

What is the maximum operating frequency of the TMS370C777ANMT?

The TMS370C777ANMT supports two clock configurations: divide-by-4 mode (0.5–5 MHz SYSCLK) and divide-by-1 mode (2–5 MHz SYSCLK) using its internal PLL. The maximum achievable system clock frequency is 5 MHz in either mode, with timing validated across commercial and industrial temperature ranges per the SPNS034C datasheet revision.

Does the TMS370C777ANMT support in-system programming of its EPROM?

Yes, the TMS370C777ANMT supports in-system programming of its 24 KB OTP EPROM. Programming requires applying 12 V to the MC pin to override write protection, then using the EPCTLL and EPCTLM control registers (P01E and P01C) to manage the 16 KB and 8 KB EPROM arrays respectively - all without removing the TMS370C777ANMT from the target board.

How does the TMS370C777ANMT handle power failure during EEPROM writes?

The TMS370C777ANMT disables data EEPROM writes automatically during reset, low-power mode, or when write protection is active - preventing corruption. Its internal charge pump eliminates need for external VPP, and the DEECTL register (P01A) provides block-level write-enable control, ensuring atomic 32-byte sector updates even under brownout conditions.

Can the ADC1 module of the TMS370C777ANMT operate independently of the CPU?

No, the ADC1 module in the TMS370C777ANMT requires CPU intervention to initiate conversions and read results. It lacks autonomous scan or DMA capability; conversion triggers are software-controlled via ADC1 control registers, and result storage relies on CPU-executed reads from the ADC1 data register - making it suitable for polled or interrupt-driven sampling, not continuous background acquisition.

What are the key differences between the TMS370C777ANMT and the SE370C777JN?

The TMS370C777ANMT uses a plastic SDIP package with one-time-programmable EPROM, while the SE370C777JN uses a windowed ceramic package enabling UV-erasable reprogramming. Both share identical functionality and pinout, but the SE370C777JN is restricted to prototyping due to limited erase endurance (~100 cycles) and lack of automotive/industrial qualification - the TMS370C777ANMT is the production-grade variant.