Siemens EF 88H Series Manual de usuario descargar pdf (Pagina 74)

Device Specification

Semiconductor Group 7-12

HWPD 60 36 I Hardware Power Down

A low level on this pin for the duration of

one machine cycle while the oscillator is

running resets the SAB 80C517A. A low

level for a longer period will force the part to

Power Down Mode with the pins floating.

(see table 7)

P5.7 - P5.0 61 - 68 37 - 44 I/O

Port 5

is a bidirectional I/O port with internal pull-

up resistors. Port 5 pins that have 1 s

written to them are pulled high by the

internal pull-up resistors, and in that state

can be used as inputs. As inputs, port 5

pins being externally pulled low will source

current (I

, in the DC characteristics)

because of the internal pull-up resistors.

This port also serves the alternate function

"Concurrent Compare" and "Set/Reset

Compare". The secondary functions are

assigned to the port 5 pins as follows:

– CCM0 to CCM7 (P5.0 to P5.7):

concurrent compare or Set/Reset

OWE 69 45 I/O Oscillator Watchdog Enable

A high level on this pin enables the

oscillator watchdog. When left

unconnected this pin is pulled high by a

weak internal pull-up resistor. When held at

low level the oscillator watchdog function is

off.

I = Input

O = Output

Pin Definitions and Functions (cont’d)

Symbol Pin Number

I/O

Function

P-LCC-84 P-MQFP-100-2

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 136 137

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Siemens EF 88H Series Manual de usuario Pagina 74