W78L801

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1. GENERAL DESCRIPTION

The W78L801 is an 8-bit microcontroller which can accommodate a wide range of supply voltages

with low power consumption. The instruction set for the W78L801 is fully compatible with the standard

8051. The W78L801 contains an 4K bytes Mask ROM; a 256 bytes RAM; four 8-bit bi-directional and

bit-addressable I/O ports; an additional 6-bit I/O port P4; two 16-bit timer/counters; a hardware

watchdog timer. These peripherals are supported by a twelve sources two-level interrupt capability.

The W78L801 does not contain serial port.

The W78L801 microcontroller has two power reduction modes, idle mode and power-down mode,

both of which are software selectable. The idle mode turns off the processor clock but allows for

continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power

consumption. The external clock can be stopped at any time and in any state without affecting the

processor.

2. FEATURES

Fully static design 8-bit CMOS microcontroller

Wide supply voltage of 1.8V to 5.5V

DC-24 MHz operation

256 bytes of on-chip scratchpad RAM

4 KB Mask-ROM

64 KB program memory address space

64 KB data memory address space

Four 8-bit bi-directional ports; Port 0 has internal pull-up resisters enabled by software

Two 16-bit timer/counters

Watchdog Timer

Direct LED drive outputs

Twelve sources, two-level interrupt capability

Wake-up via external interrupts at Port 1

EMI reduction mode

Built-in power management

Code protection mechanism

Packages:

− DIP 40:

W78L801-24

− PLCC 44:

W78L801P-24

− PQFP 44:

W78L801F-24

− Lead Free (RoHs)DIP 40:

W78L801A24DL

− Lead Free (RoHs)PLCC 44: W78L801A24PL

− Lead Free (RoHs)PQFP 44: W78L801A24FL

− Lead Free (RoHs)LQFP 48: W78L801A24LL