Z86L99X View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z86L99X

Low-Voltage Microcontrollers with ADC

Zilog 

Z86D990/Z86D991 OTP and Z86L99X ROM

Low-Voltage Microcontrollers with ADC

26

Open-Drain

I/O

OTP/Mask

Option

VCC

Pull-Up

*

Pad

Out

Note: * Pull-up resistance is

about 200 KΩ at 2.3 V and

In

75 KΩ at 5.0 V with +50%

tolerance.

Figure 12. General Input/Output Pin

Read/Write Operations

The ports are accessed as general-purpose registers. Port registers are written by

specifying the port register as an instruction’s destination register. Writing to a port

causes data to be stored in the output register of the port, and reflected externally

on any bit configured as an output.

Ports are read by specifying the port register as the source register of an instruc-

tion. When an output bit is read, data on the external pin is returned. Under normal

loading conditions, returning data on the external pin is equivalent to reading the

output register. However, if a bit is defined as an open-drain output, the data

returned is the value forced on the output pin by the external system. This value

might not be the same as the data in the output register. Reading input bits also

returns data on the external pins.

PS003807-1002

PRELIMINARY

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