12.2.HT48RA0A
12.2.1.General Description
The HT48RA0A is an 8 -bit high performance RISC -like microcontroller specifically designed for multiple
I/O product applications. The device is particularly suitable for use in products such as infrared remote
controllers and various subsystem controllers. A HALT feature is included to reduce power
consumption.
12.2.2.Features
? Operating voltage: 2.2V~3.6V
? Ten bidirectional I/O lines
? Six Schmitt trigger input lines
? One carrier output (1/2 or 1/3 duty)
? On-chip crystal and RC oscillator
? Watchdog Timer
? 1K_14 program EPROM
? 32_8 data RAM
? HALT function and wake -up feature reduce power consumption
? 62 powerful instructions
? Up to 1_s instruction cycle with 4MHz system clock
? All instructions in 1 or 2 machine cycles
? 14-bit table read instructions
? One-level subroutine nesting
? Bit manipulation instructions
? 20-pin/24-pin SOP package
12.2.3.Pin Descriptions
Pin Name I/O Code Option Description
PB0, PB1 I/O Wake-up 2-bit bidirectional input/output lines with pull -high resistors.
or None Each bit can be determined as NMOS output or Schmitt
trigger input by software instructions. Each bit can also be
configured as wake -up input by code option.
PC0/REM O Level or Level or carrier output pin
Carrier PC0 can be set as CMOS output pin or carrier output pin by
code option.
VDD - - Positive power supply
OSC2 I/O Crystal OSC1, OSC2 are connected to an RC network or a crystal
OSC1 or RC (determined by code option) for the in ternal system clock. In
the case of RC operation, OSC2 is the output terminal for
1/4 system clock
(NMOS open drain output).
VSS - - Negative power supply, ground
RES I - Schmitt trigger reset input. Active low.
PB2~PB7 I Wake-up 6-bit Schmit t trigger input lines with pull -high resistors. Each
or None bit can be configured as a wake -up input by code option.
PA0~PA7 I/O - Bidirectional 8-bit input/output port with pull -high resistors.
Each bit can be determined as NMOS output or Schmitt
trigger input by software instructions.
8
AK53 D.O.C. Service Manual 22/03/2004 |
ACEC
FUNAI
