Z0861705VSC 查看數據表（PDF） - Zilog

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Z0861705VSC

NMOS Z8® 8-BIT MCU KEYBOARD CONTROLLER

Zilog 

Z08617 NMOS Z8® 8-BIT MCU

KEYBOARD CONTROLLER

PIN FUNCTIONS (Continued)

Port 3 (P37-P30). Port 3 is an 8-bit, NMOS compatible four-

fixed-input and four-fixed-output I/O port. These eight I/O

lines have four-fixed-input (P33-P30) and four-fixed-out-

put (P37-P34) ports. Port 3 inputs have 10.4 Kohms (± 35%)

pull-up resistors and port 3 outputs are capable of driving

up to four LEDs.

Port 3 is configured under software control to provide

the following control functions: four external interrupt

request signals (IRQ3-IRQ0); timer input and output

signals (T and T - Figure 8).

IN

OUT

/RESET (input, active Low). When activated, /RESET

initializes the Z08617. When /RESET is deactivated,

program execution begins from the internal program

location at 000CH. Reset pin has a 10.4 Kohms pull-

up resistor. Once this pin is pulled Low, it takes about

150 ms for microcon-troller initialization.

Z8615

Port 3

(I/O or

Control)

Output

Pad

(a) Port 3 P34-P37

10.4 Kohms

Input

Pad

(b) Port 3 P30-P33

Figure 8. Port 3 Configuration

9

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