ST62T32B datasheet(54/86 Pages) STMICROELECTRONICS

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ST62T32B ST62E32B

CONTROL REGISTERS (Cont’d)

Status Control Register 3 (SCR3)

Address: E2h - Read/Write/Clear only

Bit 7 = CP2POL.

CP2 Edge Polarity Select.

CP2POL defines the polarity for triggering the CP2

event.

A 0 defines the action on a falling edge on the CP2

input, a 1 on a rising edge.

Bit 6 = CP2IEN.

CP2 Interrupt Enable. The Cap-

ture 2 Interrupt is masked when this bit is 0. Set-

ting the bit to 1 enables the CP2 event flag

CP2FLG to set the ARTIMER interrupt.

Bit 5 = CP2FLG.

CP2 Interrupt Flag. When this bit

is 0, no CP2 event has occurred since the last

clear of this flag. If the bit is at 1, the first CP2

event and capture into CP has occurred.

This bit cannot be set by program, only cleared.

Bit 4 = CMPIEN.

Compare Int. Enable. The Com-

pare Interrupt is masked when this bit is 0.

Setting the bit to 1 enables the Compare flag

CMPFLG to set the ARTIMER interrupt.

Bit 3 = CMPFLG.

Compare Flag. When this bit is

0, no Masked-Compare True event has occurred

since the last clear of this flag. If the bit is at 1, a

Masked-Compare event has occurred.

This bit cannot be set by program, only cleared.

Bit 2 = ZEROIEN.

Compare to Zero Int Enable.

The Masked-Counter Zero Interrupt is masked

when this bit is 0. Setting the bit to 1 enables the

ZEROFLG flag to set the ARTIMER interrupt.

Bit 1 = ZEROFLG.

Compare to Zero Flag. When

this bit is 0, no Masked-Counter Zero event has

occurred since the last clear of this flag. If the bit is

at 1, a Masked-Counter Zero event has occurred

as the Masked Counter state equals 0 when run-

ning or on hold (not on Reset).

Bit 0 = PWMMD.

PWM Output Mode Control.The

PWM Output mode is set by this bit; when 0, the

PWM output is run in set/reset mode (the PWM

output is set on a Masked-Counter Zero event and

is reset when on a Masked-Compare event).

When 1 the PWM output is in toggle mode; PWM

toggles its state on every Masked-Compare event.

Notes:

A Masked-Compare is the logical AND of the Mask

compared with the logical AND of the compare

A Masked-Counter Zero is the logical AND of the

Mask Register MASK with the Counter Register

CT, compared with zero: [(MASK & CT) = 0000h]

CP2POL CP2IEN CP2FLG CMPIEN

CMFLG

ZEROIEN ZEROFLG PWMMD

158

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