Universum FT-81012, Service Manual

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The internal ADC is an 8-bit, four-channel converter. The input channels are P20 to P23, the analog supply are pins VDDA
and VSSA. A flexible overvoltage / undervoltage detector is included (SDA 30C264 only).
Port 4 can be used as a standard port or as memory extension address bits.
Increased system reliability can be achieved by activating the integrated watchdog timer.
Efficient use of program memory results from an instruction set consisting of 49 single-byte, 46 two-byte and 16 three-
byte instructions. Using an internal clock frequency of 12 MHz, 64 instructions execute in 0.5 us and 45b instructions
execute in 1.0us. The remaining instructions (multiple and devide) require only 2us. The number of bytes in each
instruction and the number of oscillator periods required for execution are listed in the instruction
Based on the SDA 30C163 and similar to the SDA 30C164, the SDA 30C26x comprise double stack size for the
extension memory (32 byte) and seven additional data pointer registers.
The SDA 30C263 is a reduced version of the SDA 30C264. The SDA 30C264 is functionally compatible to the
SDA 30C164, but uses a different package and a different Reset input stage (P-MQFP-80-1 instead of P-LCC-84).
If using the P-MQFP-64-1 Package, some I/O-features are not available.
Features:
n SAB 8051 Architecture
- On-chip oscillator and clock circuits
- Binary or decimal arithmetic
- Signal-overflow detection and parity computation
- Integrated Boolean processor for control applications
- Full depth stacks for subroutines return linkage and data storage
- Four priority level, nested interrupt structure
- 0.5us instruction cycle at 12 MHz internal clock rate
- 8 data pointer registers
n Serial interface
- Full duplex UART-interface
- I²C compatible interface (SDA 30C264 only)
n On-Chip RAM
- Direct byte and bit addressability
- Four register banks
- 256 bytes of data memory, including 128 user-defined software flags
- 2048 bytes of data memory accessible with MOVX-instructions (SDA 30C263; 1024 bytes)
n External Program Memory Interface
- 512 Kbytes of program memory may be addressed by a 8-bit data bus and a 16 + 3-bit address bus
- Extension stacks depth 32 byte
n 30 Bi-directional I/O-Lines
- Two 8-bit ports, one comprising up to eight programmable D/A-outputs
- One 4-bit input port, also used for analog input
- One 8-bit port with open drain output
- One 2-bit port with optional memory extension function
n Pulse Width Modulation Unit
- Up to eight programmable PWM-output channels for low cost digital-to-analog conversion
n Timers
- Two 16-bit general purpose timer/event counters
- Watchdog timer
n Analog-to-Digital Converter
- Four multiplexed input channels with 8-bit resolution
- Overvoltage/Undervoltage Detector with interrupts capability
SERIAL ACCESS 32K EEPROM
24LC32A
It is the 32Kbit electrically erasable programmable memory. The memory is compatible with the I2C standard, two wire serial
interface, which uses a bi-directional data bus and serial clock.
Features:
n Single supply with operation down to 2.5V
- Maximum writes current 3mA at 6.0V
- Standby current 1mA max at 2.5V
n 2-wire serial interface bus, I 2 CÔ compatible
n 100 kHz (2.5V) and 400 kHz (5V) compatibility
n Self-timed ERASE and WRITE cycles
n Power on/off data protection circuitry
n Hardware write protect
n 1,000,000 Erase/Write cycles guaranteed
n 32-byte page or byte writes modes available
n Schmitt trigger filtered inputs for noise suppression