Renesas UPD78F9212CS(S)-CAB-A

Overview

UPD78F9212CS(S)-CAB-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0S family, featuring 4 KB on-chip Flash memory, 128 bytes of high-speed RAM, and integrated peripherals including a 10-bit 4-channel ADC, three timers (16-bit timer/event counter, 8-bit timer H1, watchdog timer), and 14 I/O pins. It operates across 2.0–5.5 V supply and −40 to +85°C ambient, targeting cost-sensitive embedded control in household appliances and industrial equipment.

For engineers reviewing the UPD78F9212CS(S)-CAB-A datasheet, UPD78F9212CS(S)-CAB-A pinout, UPD78F9212CS(S)-CAB-A application, or UPD78F9212CS(S)-CAB-A equivalent, key selection considerations include its 16-pin SDIP package, self-programmable Flash architecture, dual-clock system (X1 crystal up to 10 MHz / internal 8 MHz oscillator), and A/D converter reference tied to VDD - all critical for low-power sensor interface and real-time motor control designs.

Technical Context

The UPD78F9212CS(S)-CAB-A implements the 78K0S CPU core with minimum instruction execution time selectable from 0.2 µs (at 10 MHz X1 clock) to 3.2 µs, supporting flexible power/performance trade-offs. Its memory map spans 64 KB, with Flash organized for single-voltage in-system programming and erase operations.

Peripherals are clocked via configurable sources: crystal/ceramic (2–10 MHz), external clock input, or internal oscillators (8 MHz high-speed, 240 kHz low-speed). The A/D converter uses VDD as reference and shares analog inputs (ANI0–ANI3) with port pins P20–P23, requiring stable VDD and dedicated VSS grounding per design notes.

Key Specifications

Pinout & Package

UPD78F9212CS(S)-CAB-A is housed in a 16-pin plastic SDIP (7.62 mm, 300 mil) package with gull-wing leads. Pin functions support mixed-signal operation: analog inputs share pins with digital I/O, and oscillator connections (X1/P23, X2/P22) require careful PCB layout per Renesas guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F9212CS(S)-CAB-A, the R5F100PLASP#30 offers greater memory and modern low-power features but requires PCB redesign, while UPD78F9211CS-CAB-A provides identical hardware compatibility at reduced Flash capacity - making it ideal for firmware-downsized legacy upgrades.

Availability

UPD78F9212CS(S)-CAB-A is available at Aetrix Electronics and suitable for household appliance control, industrial sensor nodes, and consumer electronics requiring stable component supply across extended product lifecycles.

Supply support for UPD78F9212CS(S)-CAB-A 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

Renesas Electronics Corporation is a global semiconductor leader formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The UPD78F9212CS(S)-CAB-A belongs to the 78K0S family - designed specifically for cost-optimized, low-pin-count embedded control in appliances, toys, and industrial equipment where Flash programmability and analog integration are essential.

FAQ

What is the maximum crystal frequency supported by UPD78F9212CS(S)-CAB-A?

The UPD78F9212CS(S)-CAB-A supports crystal or ceramic resonators up to 10 MHz when VDD is 2.7–5.5 V, and up to 5 MHz when VDD is 2.0–2.7 V. External clock input also accepts frequencies within these ranges. Operation above 10 MHz violates absolute maximum ratings and is not guaranteed.

Does UPD78F9212CS(S)-CAB-A support in-system programming (ISP)?

Yes, UPD78F9212CS(S)-CAB-A features single-voltage self-programming Flash memory, enabling in-system programming using only the VDD supply - no external high-voltage programmer is required. Programming is performed via on-chip serial interface under MCU control.

How is the A/D converter reference configured on UPD78F9212CS(S)-CAB-A?

The UPD78F9212CS(S)-CAB-A uses VDD as the A/D converter reference voltage. When using the ADC, VDD must be stabilized within 2.7–5.5 V and decoupled per Renesas layout guidelines. VSS serves as the analog ground reference and must connect to a clean 0 V plane.

What is the function of the P34 pin on UPD78F9212CS(S)-CAB-A?

The P34 pin on UPD78F9212CS(S)-CAB-A is the active-low RESET input. It initiates hardware reset when pulled low. An external pull-up resistor is mandatory per Renesas design notes. Internal reset sources include power-on clear, low-voltage detection, and watchdog timeout.

Can UPD78F9212CS(S)-CAB-A operate from a 2.2 V supply?

Yes, UPD78F9212CS(S)-CAB-A is rated for VDD = 2.0–5.5 V, but functional operation requires ≥2.2 V due to the 2.1 V ±0.1 V power-on clear (POC) detection threshold. Below 2.2 V, the device may fail to initialize reliably or experience unintended resets.