Zilog Z8PE002 Manual do Utilizador descarregar pdf (Página 36)

Z8PE002

Z8Plus OTP Microcontroller ZiLOG

36 P R E L I M I N A R Y DS008700-Z8X0799

PORT B

Port B Description

Port B is a 6-bit (bidirectional), CMOS-compatible I/O port.

These six I/O lines can be configured under software control

to be an input or output. Each bit is configured

independently from the other bits. That is, one bit may be

set to

INPUT while another bit is set to OUTPUT.

In addition to standard input/output capability, five pins of

Port B provide special functionality as indicated in Table 15.

Special functionality is invoked via the Port B special func-

tion register. Port B, bit 5, is an open-drain-only pin when

in output mode. There is no high-side driver on the output

stage, nor is there any high-side protection device, because

PB5 acts as the V

pin for EPROM programming mode.

The user should always place an external protection diode

on this pin. See Figure 32.

Table 15. Port B Special Functions

Port

Input Special

Function

Output Special

Function

PB0 Stop Mode Recovery

Input

None

PB1 None T0 Output

PB2 IRQ3 None

PB3 Comparator

Reference Input

None

PB4 Comparator Signal

Input/IRQ1/IRQ4

None

Figure 32. Port B Special Function Register

D7 D6 D5 D4 D3 D2 D1 D0

PTBSFR

1 = Enable PB0 as SMR Input

0 = No Special Functionality

1 = Enable PB1 as T0 Output

0 = No Special Functionality

1 = Enable PB2 as IRQ3 Input

0 = No Special Functionality

Reserved (must be 0)

1 = Analog Comparator on PB3 and PB4

0 = Digital Inputs on PB3 and PB4

1 = PB4 Interrupts Enabled

0 = PB4 Interrupts Disabled

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 47 48

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