ST7L19 datasheet(66/138 Pages) STMICROELECTRONICS

66 / 138 page

ST7L15, ST7L19

66/138

DUAL 12-BIT AUTORELOAD TIMER 4 (cont’d)

AUTORELOAD REGISTER (ATR1H)

Read / Write

Reset Value: 0000 0000 (00h)

AUTORELOAD REGISTER (ATR1L)

Read / Write

Reset Value: 0000 0000 (00h)

Bits 15:12 = Reserved, must be kept cleared

Bits 11:0 = ATR1[11:0] Autoreload Register 1

This is a 12-bit register which is written by soft-

ware. The ATR1 register value is automatically

loaded into the upcounter CNTR1 when an over-

flow occurs. The register value is used to set the

PWM frequency.

PWM OUTPUT CONTROL REGISTER

(PWMCR)

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:0 = OE[3:0] PWMx Output Enable.

These bits are set and cleared by software and

cleared by hardware after a reset.

0: PWM mode disabled. PWMx Output Alternate

Function disabled (I/O pin free for general purpose

I/O)

1: PWM mode enabled

PWMx CONTROL STATUS REGISTER

(PWMxCSR)

Read / Write

Reset Value: 0000 0000 (00h)

Bits 7:4 = Reserved, must be kept cleared

Bit 3 = OP_EN One Pulse Mode Enable (not appli-

cable to ROM devices)

This bit is read/write by software and cleared by

hardware after a reset. This bit enables the One

Pulse feature for PWM2 and PWM3. (Only availa-

ble for PWM3CSR)

0: One Pulse mode disable for PWM2/3.

1: One Pulse mode enable for PWM2/3.

Bit 2 = OPEDGE One Pulse Edge Selection (not

applicable to ROM devices)

This bit is read/write by software and cleared by

hardware after a reset. This bit selects the polarity

of the LTIC signal for One Pulse feature. This bit

will be effective only if OP_EN bit is set. (Only

available for PWM3CSR)

0: Falling edge of LTIC is selected.

1: Rising edge of LTIC is selected.

Bit 1 = OPx PWMx Output Polarity

This bit is read/write by software and cleared by

hardware after a reset. This bit selects the polarity

of the PWM signal.

0: The PWM signal is not inverted.

1: The PWM signal is inverted.

Bit 0 = CMPFx PWMx Compare Flag

This bit is set by hardware and cleared by software

by reading the PWMxCSR register. It indicates

that the upcounter value matches the Active DCRx

0: Upcounter value does not match DCRx value.

1: Upcounter value matches DCRx value.

ATR11 ATR10 ATR9

ATR8

ATR7

ATR6

ATR5

ATR4

ATR3

ATR2

ATR1

ATR0

OE3

OE2

OE1

OE0

OP_EN OPEDGE OPx CMPFx

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