Описание
The P89LPC9151/9161/9171 is a single-chip microcontroller, available in low cost packages, based on a high performance processor architecture that executes instructions in two to four clocks, six times the rate of standard 80C51 devices. Many system-level functions have been incorporated into the device in order to reduce component count, board space, and system cost.
Principal features
- 2 KB byte-erasable flash code memory organized into 256-byte sectors and 16-byte pages. Single-byte erasing allows any byte(s) to be used as non-volatile data storage.
- 256-byte RAM data memory.
- 4-input multiplexed 8-bit ADC/single DAC output. Two analog comparators with selectable inputs and reference source.
- Two 16-bit counter/timers. Timer 0 may be configured to toggle a port output upon timer overflow or to become a PWM output.
- A 23-bit system timer that can also be used as real-time clock consisting of a 7-bit prescaler and a programmable and readable 16-bit timer.
- Enhanced UART with a fractional baud rate generator, break detect, framing error detection, and automatic address detection; 400 kHz byte-wide I2C-bus communication port.
- 2.4 V to 3.6 V VDD operating range. I/O pins are 5 V tolerant (may be pulled up or driven to 5.5 V).
- Enhanced low voltage (brownout) detect allows a graceful system shutdown when power fails.
- 14-pin TSSOP packages with 10 I/O pins minimum and up to 12 I/O pins while using on-chip oscillator and reset options.
Additional features
- A high performance 80C51 CPU provides instruction cycle times of 111 ns to 222 ns for all instructions except multiply and divide when executing at 18 MHz. This is six times the performance of the standard 80C51 running at the same clock frequency. A lower clock frequency for the same performance results in power savings and reduced EMI.
- In-Application Programming (IAP-Lite) and byte erase allows code memory to be used for non-volatile data storage.
- Serial flash In-Circuit Programming (ICP) allows simple production coding with commercial EPROM programmers. Flash security bits prevent reading of sensitive application programs.
- Watchdog timer with separate on-chip oscillator, nominal 400 kHz, calibrated to ±5 %, requiring no external components. The watchdog prescaler is selectable from eight values.
- High-accuracy internal RC oscillator option, with clock doubler option, allows operation without external oscillator components. The RC oscillator option is selectable and fine tunable.
- Clock switching on the fly among internal RC oscillator, watchdog oscillator, external clock input provides optimal support of minimal power active mode with fast switching to maximum performance.
- Idle and two different power-down reduced power modes. Improved wake-up from Power-down mode (a LOW interrupt input starts execution). Typical power-down current is 1 µA (total power-down with voltage comparators disabled).
- Active-LOW reset. On-chip power-on reset allows operation without external reset components. A software reset function is also available.
- Configurable on-chip oscillator with frequency range options selected by user programmed flash configuration bits. Oscillator options support frequencies from 20 kHz to the maximum operating frequency of 18 MHz.
- Oscillator fail detect. The watchdog timer has a separate fully on-chip oscillator allowing it to perform an oscillator fail detect function.
- Programmable port output configuration options: quasi-bidirectional, open drain, push-pull, input-only.
- High current sourcing/sinking (20 mA) at 4 I/O pins on the P89LPC9151. All other port pins have high sinking capability (20 mA). A maximum limit is specified for the entire chip.
- Port input pattern match detect. Port 0 may generate an interrupt when the value of the pins match or do not match a programmable pattern.
