ST6210LN6/HWD View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST6210LN6/HWD

8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET

STMicroelectronics 

ST6208C/ST6209C/ST6210C/ST6220C

8-BIT TIMER (Cont’d)

9.2.4 Functional Description

There are three operating modes, which are se-

lected by the TOUT and DOUT bits (see TSCR

register). These three modes correspond to the

two clocks which can be connected to the 7-bit

prescaler (fINT ÷ 12 or TIMER pin signal), and to

the output mode.

The settings for the different operating modes are

summarized Table 13.

Table 13. Timer operating modes

TOUT DOUT

Timer

Fu nction

0

0

Event Counter

(input)

0

1

Gated input

(input)

1

0

Output “0”

(output)

1

1

Output “1”

(output)

Applica tion

External counter clock

source

External Pulse length

measurement

Output signal

generation

9.2.4.1 Gated mode

(TOUT = “0”, DOUT = “1”)

In this mode, the prescaler is decremented by the

Timer clock input, but only when the signal on the

TIMER pin is held high (fINT/12 gated by TIMER

pin). See Figure 28 and Figure 29.

This mode is selected by clearing the TOUT bit in

the TSCR register (i.e. as input) and setting the

DOUT bit.

Note: In this mode, if the TIMER pin is multi-

plexed, the corresponding port control bits have to

be set in input with pull-up configuration through

the DDR, OR and DR registers. For more details,

please refer to the I/O Ports section.

Figure 28. fTIMER Clock in Gated Mode

fINT/12

TI MER

fEXT

fPRESCALER

Figure 29. Gated Mode Operation

COUNTE R VALUE

xx1 VALUE 1

xx2

VALUE 2

TIMER PIN

1

PULSE LENGTH

TIMER CLOCK

48/105

1

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