TC9028AF

The TC9028AF is CMOS LSI for infrared remote control transmitting suitable for remote controlling TV,VCR, video disk, CD-player etc.Using a Obit Microcontroller, various transmittings are structured by a programming.There are two data memory addressing modes of TC9028AF. One is register indirect addressing mode,where the L register specifies an address. The other is direct addressing mode, where the lower 3 bits of the instruction field directly specify an address.

Features of the TC9028AF are:(1)low voltage operation:2.0~4.0V; (2)low power dissipation:1A (at hold function);(3)program memory (ROM) capacity:768 x 8bit;(4)data memory (RAM) capacity:16 x 4bit;(5)instruction:44kinds; (6)timer/counter:10~15bit;(7)subcarrier frequency:fosc/12, fosc/8,fosc/24, fosc/16 (option); (8)oscillating frequency:400~800kHz; (9)instruction execution time:11s (at 455kHz).The program counter is a 10bit binary counter which holds the program memory address of the next instruction to be executed.The program counter is normally incremented for each instruction fetch.When branch instructions and subroutine instructions are executed. the values specified in Table 2.1 are set. The program counter is initialized to 0 at reset.

The absolute maximum ratings of the TC9028AF can be summarized as:(1)supply voltage:-0.3 to 5.0 V;(2)input voltage:Vss-0.3 to Vdd+0.3V;(3)storage temperature:-40 to 125;(4)operating temperature:-20 to 75;(5)power dissipation:300mW.Hold mode is also cancelled by setting the RST pin to low level. In this case, the reset operation is performed immediately. Since normal operation begins at the same time the reset operation is cancelled, the RST pin must be kept at the low level for the warming-up time until oscillation becomes stable.If input to the HCAN pin is at high level, executing the hold instruction does not enter hold mode but instead moves immediately to the cancellation sequence (warming-up).The clock generator is a circuit which generates the fundamental clock pulse (CP) as the basis for the system clock supplied to the CPU. The fundamental clock is easily established by connecting the oscillator to the XT and XT pins. A clock can also be input from an external oscillator.