DESCRIPTION

The 7540 Group is the 8-bit microcomputer based on the 740 family core technology.

The 7540 Group has a serial I/O, 8-bit timers, a 16-bit timer, and an A-D converter, and is useful for control of home electric appliances and office automation equipment.

FEATURES

• Basic machine-language instructions ....................................... 71

• The minimum instruction execution time .......................... 0.50 µs

(at 8 MHz oscillation frequency for the shortest instruction)

• Memory size ROM ............................................ 16K to 32K bytes

RAM .............................................. 512 to 768 bytes

• Programmable I/O ports ........................................................... 29

(25 in 32-pin version)

• Interrupts .................................................. 15 sources, 15 vectors

(14 sources, 14 vectors for 32-pin version)

• Timers ............................................................................ 8-bit ✕ 4

16-bit ✕ 1

• Serial I/O1 ...................................................................... 8-bit ✕ 1

(UART or Clock-synchronized)

• Serial I/O2 ...................................................................... 8-bit ✕ 1

(Clock-synchronized)

• A-D converter ................................................ 10-bit ✕ 8 channels

(6 channels for 32-pin version)

• Clock generating circuit ............................................. Built-in type

(low-power dissipation by a ring oscillator enabled)

(connect to external ceramic resonator or quartz-crystal oscillator

permitting RC oscillation)

• Watchdog timer ............................................................ 16-bit ✕ 1

• Power source voltage

XIN oscillation frequency at ceramic oscillation, in high-speed mode

At 8 MHz .................................................................... 4.0 to 5.5 V

At 4 MHz .................................................................... 2.4 to 5.5 V

At 2 MHz .................................................................... 2.2 to 5.5 V

XIN oscillation frequency at RC oscillation

At 4 MHz .................................................................... 4.0 to 5.5 V

At 2 MHz .................................................................... 2.4 to 5.5 V

At 1 MHz .................................................................... 2.2 to 5.5 V

• Power dissipation ............................................ 25 mW (standard)

• Operating temperature range ................................... –20 to 85 °C

(–40 to 85 °C for extended operating temperature version)

APPLICATION

Office automation equipment, factory automation equipment, home electric appliances, consumer electronics, car, etc.