SAB-C505C-2RM datasheet(30/85 Pages) SIEMENS

Part #	SAB-C505C-2RM

Description	8-Bit CMOS Microcontroller

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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30 / 85 page

Semiconductor Group

30

1997-12-01

C505 / C505C

C505A / C505CA

Timer / Counter 0 and 1

Timer/Counter 0 and 1 can be used in four operating modes as listed in table 7 :

In the “timer” function (C/T = ‘0’) the register is incremented every machine cycle. Therefore the

count rate is

f

OSC/6.

In the “counter” function the register is incremented in response to a 1-to-0 transition at its

corresponding external input pin (P3.4/T0, P3.5/T1). Since it takes two machine cycles to detect a

falling edge the max. count rate is

f

OSC/12. External inputs INT0 and INT1 (P3.2, P3.3) can be

programmed to function as a gate to facilitate pulse width measurements. Figure 10 illustrates the

input clock logic.

Figure 10

Timer/Counter 0 and 1 Input Clock Logic

Table 7

Timer/Counter 0 and 1 Operating Modes

Mode

Description

TMOD

Input Clock

M1

M0

internal

external (max)

0

8-bit timer/counter with a

divide-by-32 prescaler

00

f

OSC/6x32

f

OSC/12x32

1

16-bit timer/counter

1

f

OSC/6

f

OSC/12

2

8-bit timer/counter with

8-bit autoreload

10

3

Timer/counter 0 used as one

8-bit timer/counter and one

8-bit timer

Timer 1 stops

11

MCS03117

1

&

OSC

C/T = 0

C/T = 1

Control

=1

6

TR1

P3.5/T1

(TMOD)

P3.2/INT0

f

Timer 0/1

Input Clock

OSC/6

P3.4/T0

TR0

Gate

P3.3/INT1

÷

_

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SAB-C505C-2RM Datasheet(PDF) 30 Page - Siemens Semiconductor Group

SAB-C505C-2RM Datasheet(HTML) 30 Page - Siemens Semiconductor Group

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