HT48R50-2

The HT48R50-2 is an 8-bit high performance RISC-like microcontroller designed for multiple I/O product applications.The device is particularly suitable for use in products such as remote controllers, fanlight controllers, washing machine controllers, scales, toys and various subsystem controllers.A halt feature is included to reduce power consumption.The program and option PROM can be electritally programmed making the HT48R50-2 suitable for use in product development.

The HT48R50-2 has the following features include:(1)32 bidirectional I/O lines; (2)one interrupt input; (3)one 8-bit and one 16-bit programmable timer/event counters with overflow interrupts; (4)on-chip crystal and RC oscillator; (5)watchdog timer; (6)4K x 15 program memory PROM; (7)1 x 14 option memory PROM; (8)184 x 8 data memory RAM; (9)halt function and wake-up feature reduce power consumption; (10)four-level subroutine nesting; (11)all instructions in one or two machine cycles; (12)15-bit table read instruction; (13)bit manipulation instruction; (14)63 powerful instructions.The accumulator is closely related to ALU operations. It is also mapped to location 05H of the data memory and is capable of carrying out immediate data operations. The data movement between two data memory locations must pass through the accumulator.

The absolute maximum ratings of the HT48R50-2 are:(1)storage temperature:-50 to +125°C;(2)operating temperature:-25 to 70°C;(3)supply voltage:-0.3 to +5.5V;(4)input voltage:Vss-0.3 to Vdd+0.3V.These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.This is a special part of the memory which is used to save the contents of the program counter (PC) only. The stack is organized into four levels and is neither part of the data nor part of the program space, and is neither readable nor writeable. The activated level is indexed by the stack pointer (SP) and is neither readable nor writeable. At a subroutine call or interrupt acknowledgment, the contents of the program counter are pushed onto the stack.