ST92T195 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92T195

48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER

STMicroelectronics 

ST92195C/D - STANDARD TIMER (STIM)

STANDARD TIMER (Cont’d)

7.2.5 Register Description

COUNTER HIGH BYTE REGISTER (STH)

R240 - Read/Write

Register Page: 11

Reset value: 1111 1111 (FFh)

7

0

ST.15 ST.14 ST.13 ST.12 ST.11 ST.10 ST.9 ST.8

Bits 7:0 = ST.[15:8]: Counter High-Byte.

COUNTER LOW BYTE REGISTER (STL)

R241 - Read/Write

Register Page: 11

Reset value: 1111 1111 (FFh)

7

0

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

Bits 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

Register Page: 11

Reset value: 1111 1111 (FFh)

7

0

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

Bits 7:0 = STP.[7:0]: Prescaler.

The Prescaler value for the Standard Timer is pro-

grammed into this register. When reading the STP

register, the returned value corresponds to the

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

Register Page: 11

Reset value: 0001 0100 (14h)

REGISTER

7

0

ST-SP S-C INMD1 INMD2 INEN INTS OUTMD1 OUTMD2

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

Bits 5:4 = INMD[1:2]: Input Mode Selection.

These bits select the Input functions as shown in

Section 7.2.2.2, Standard Timer Input Modes (ST9

devices with Standard Timer Input STIN), when

enabled by INEN.

INMD1 INMD2 Mode

0

0

Event Counter mode

0

1

Gated input mode

1

0

Triggerable mode

1

1

Retriggerable mode

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.

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

These bits select the output functions as described

in Section 7.2.2.4, Standard Timer Output Modes.

OUTMD1 OUTMD2 Mode

0

0

No output mode

0

1

Square wave output mode

1

x

PWM output mode

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