ST90135 datasheet(130/190 Pages) STMICROELECTRONICS

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ST90158 - STANDARD TIMER (STIM)

STANDARD TIMER (Cont’d)

9.3.5 Register Description

COUNTER HIGH BYTE REGISTER (STH)

R240 - Read/Write

Reset value: 1111 1111 (FFh)

Bit 7:0 = ST.[15:8]:

Counter High-Byte.

COUNTER LOW BYTE REGISTER (STL)

R241 - Read/Write

Reset value: 1111 1111 (FFh)

Bit 7:0 = ST.[7:0]:

Counter Low Byte.

Writing to the STH and STL registers allows the

user to enter the Standard Timer constant, while

reading it provides the counter’s current value.

Thus it is possible to read the counter on-the-fly.

STANDARD TIMER PRESCALER REGISTER

(STP)

R242 - Read/Write

Reset value: 1111 1111 (FFh)

Bit 7:0 = STP.[7:0]:

Prescaler.

The Prescaler value for the Standard Timer is pro-

grammed into this register. When reading the STP

programmed data instead of the current data.

00h: No prescaler

01h: Divide by 2

FFh: Divide by 256

STANDARD

TIMER

CONTROL

(STC)

R243 - Read/Write

Reset value: 0001 0100 (14h)

Bit 7 = ST-SP:

Start-Stop Bit.

This bit is set and cleared by software.

0: Stop counting

1: Start counting

Bit 6 = S-C:

Single-Continuous Mode Select.

This bit is set and cleared by software.

0: Continuous Mode

1: Single Mode

Bit 5:4 = INMD[1:2]:

Input Mode Selection.

These bits select the Input functions as shown in

Section 9.3.2.2, when enabled by INEN.

Bit 3 = INEN:

Input Enable.

This bit is set and cleared by software. If neither

the STIN pin nor the CLOCK2 line are present,

INEN must be 0.

0: Input section disabled

1: Input section enabled

Bit 2 = INTS:

Interrupt Selection.

0: Standard Timer interrupt enabled

1: Standard Timer interrupt is disabled and the ex-

ternal interrupt pin is enabled.

Bit 1:0 = OUTMD[1:2]: Output Mode Selection.

These bits select the output functions as described

in Section 9.3.2.4.

ST.15 ST.14 ST.13 ST.12 ST.11 ST.10 ST.9

ST.8

ST.7

ST.6

ST.5

ST.4

ST.3

ST.2

ST.1

ST.0

STP.7 STP.6 STP.5 STP.4 STP.3 STP.2 STP.1 STP.0

ST-

S-C

INMD

INEN INTS

OUTM

INMD1 INMD2 Mode

Event Counter mode

Gated input mode

Triggerable mode

Retriggerable mode

OUTMD1 OUTMD2 Mode

No output mode

Square wave output mode

PWM output mode

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