General description
The P89LPC9408 is a multi-chip module consisting of a P89LPC938 single-chipmicrocontroller combined with a PCF8576D universal LCD controller in a low-cost 64-pinpackage. The LCD controller provides 32 segments and supports from 1 to 4 backplanes.Display overhead is minimized by an on-chip display RAM with auto-incrementaddressing.
Features
Principal features
- 8 kB byte-erasable flash code memory organized into 1 kB sectors and 64-byte pages.Single-byte erasing allows any byte(s) to be used as non-volatile data storage.
- 256-byte RAM data memory.
- 512-byte customer Data EEPROM on chip allows serialization of devices, storage ofset-up parameters, etc.
- 32 segment x 4 backplane LCD controller supports from 1 to 4 backplanes.
- 8-input multiplexed 10-bit ADC. Two analog comparators with selectable inputs andreference source.
- Two 16-bit counter/timers (each may be configured to toggle a port output upon timeroverflow or to become a PWM output) and a 23-bit system timer that can also be usedas a Real-Time Clock (RTC).
- Enhanced UART with fractional baud rate generator, break detect, framing errordetection, and automatic address detection; 400 kHz byte-wide I2C-buscommunication port and SPI communication port.
- CCU provides PWM, input capture, and output compare functions.
- High-accuracy internal RC oscillator option allows operation without external oscillatorcomponents. The RC oscillator option is selectable and fine tunable.
- 64-pin LQFP package with 20 microcontroller I/O pins minimum and up to 23microcontroller I/O pins while using on-chip oscillator and reset options.
Additional features
- 2.4 V to 3.6 V VDD operating range. I/O pins are 5 V tolerant (may be pulled up ordriven to 5.5 V).
- Serial flash In-Circuit Programming (ICP) allows simple production coding withcommercial EPROM programmers. Flash security bits prevent reading of sensitiveapplication programs.
- A high performance 80C51 CPU provides instruction cycle times of 111 ns to 222 nsfor all instructions except multiply and divide when executing at 18 MHz. This is sixtimes the performance of the standard 80C51 running at the same clock frequency. Alower clock frequency for the same performance results in power savings and reducedEMI.
- Serial flash In-System Programming (ISP) allows coding while the device is mountedin the end application.
- In-Application Programming (IAP) of the flash code memory. This allows changing thecode in a running application.
- Watchdog timer with separate on-chip oscillator, requiring no external components.The watchdog prescaler is selectable from eight values.
- Low voltage detect (brownout) allows a graceful system shutdown when power fails.May optionally be configured as an interrupt.
- Idle and two different power-down reduced power modes. Improved wake-up fromPower-down mode (a LOW interrupt input starts execution). Typical power-downcurrent is 9 uA typical (total power-down with voltage comparators disabled).
- Active-LOW reset. On-chip power-on reset allows operation without external resetcomponents. A reset counter and reset glitch suppression circuitry prevent spuriousand incomplete resets. A software reset function is also available.
- Configurable on-chip oscillator with frequency range options selected by userprogrammed flash configuration bits. Oscillator options support frequencies from20 kHz to the maximum operating frequency of 18 MHz.
- Oscillator fail detect. The watchdog timer has a separate fully on-chip oscillatorallowing it to perform an oscillator fail detect function.
- Programmable port output configuration options: quasi-bidirectional, open drain,push-pull, input-only.
- Port ´input pattern match´ detect. Port 0 may generate an interrupt when the value ofthe pins match or do not match a programmable pattern.
- LED drive capability (20 mA) on all port pins. A maximum limit is specified for theentire chip.
- Controlled slew rate port outputs to reduce EMI. Outputs have approximately 10 nsminimum ramp times.
- Only power and ground connections are required to operate the P89LPC9408 wheninternal reset option is selected.
- Four interrupt priority levels.
- Eight keypad interrupt inputs, plus two additional external interrupt inputs.
- Schmitt trigger port inputs.
- Second data pointer.
