Rev. 1.4 61

C8051F320/1

SFR Definition 7.2. CPT0MX: Comparator0 MUX Selection

Bits7–6: UNUSED. Read = 00b, Write = don’t care.

Bits5–4: CMX0N1–CMX0N0: Comparator0 Negative Input MUX Select.

These bits select which Port pin is used as the Comparator0 negative input.

Bits3–2: UNUSED. Read = 00b, Write = don’t care.

Bits1–0: CMX0P1–CMX0P0: Comparator0 Positive Input MUX Select.

These bits select which Port pin is used as the Comparator0 positive input.

R/W R/W R/W R/W R/W R/W R/W R/W Reset Value

- - CMX0N1 CMX0N0 - - CMX0P1 CMX0P0 00000000

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0x9F

CMX0N1 CMX0N0 Negative Input

00 P1.1

01 P1.5

10 P2.1

11 P2.5*

CMX0P1 CMX0P0 Positive Input

00 P1.0

01 P1.4

10 P2.0

11 P2.4*

*Note: P2.4 and P2.5 available only on

C8051F320 devices; selection

reserved on C8051F321 devices.

C8051F320/1

62 Rev. 1.4

SFR Definition 7.3. CPT0MD: Comparator0 Mode Selection

Bits7–6: UNUSED. Read = 00b. Write = don’t care.

Bit5: CP0RIE: Comparator0 Rising-Edge Interrupt Enable.

0: Comparator0 rising-edge interrupt disabled.

1: Comparator0 rising-edge interrupt enabled.

Bit4: CP0FIE: Comparator0 Falling-Edge Interrupt Enable.

0: Comparator0 falling-edge interrupt disabled.

1: Comparator0 falling-edge interrupt enabled.

Bits3–2: UNUSED. Read = 00b. Write = don’t care.

Bits1–0: CP0MD1–CP0MD0: Comparator0 Mode Select

These bits select the response time for Comparator0.

R/W R/W R/W R/W R/W R/W R/W R/W Reset Value

- - CP0RIE CP0FIE - - CP0MD1 CP0MD0 00000010

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0x9D

Mode CP0MD1 CP0MD0 CP0 Response Time (TYP)

000 100 ns

101 175 ns

210 320 ns

3 1 1 1050 ns

Rev. 1.4 63

C8051F320/1

SFR Definition 7.4. CPT1CN: Comparator1 Control

Bit7: CP1EN: Comparator1 Enable Bit.

0: Comparator1 Disabled.

1: Comparator1 Enabled.

Bit6: CP1OUT: Comparator1 Output State Flag.

0: Voltage on CP1+ < CP1–.

1: Voltage on CP1+ > CP1–.

Bit5: CP1RIF: Comparator1 Rising-Edge Flag.

0: No Comparator1 Rising Edge has occurred since this flag was last cleared.

1: Comparator1 Rising Edge has occurred.

Bit4: CP1FIF: Comparator1 Falling-Edge Flag.

0: No Comparator1 Falling-Edge has occurred since this flag was last cleared.

1: Comparator1 Falling-Edge has occurred.

Bits3–2: CP1HYP1–0: Comparator1 Positive Hysteresis Control Bits.

00: Positive Hysteresis Disabled.

01: Positive Hysteresis = 5 mV.

10: Positive Hysteresis = 10 mV.

11: Positive Hysteresis = 20 mV.

Bits1–0: CP1HYN1–0: Comparator1 Negative Hysteresis Control Bits.

00: Negative Hysteresis Disabled.

01: Negative Hysteresis = 5 mV.

10: Negative Hysteresis = 10 mV.

11: Negative Hysteresis = 20 mV.

R/W R R/W R/W R/W R/W R/W R/W Reset Value

CP1EN CP1OUT CP1RIF CP1FIF CP1HYP1 CP1HYP0 CP1HYN1 CP1HYN0 00000000

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0x9A

Part #	C8051F321-GMR
Description	16KB,10ADC,USB,28PIN MCU (LEAD FREE) MLP28 -40 TO 85 DEG.
Category	IC
Availability	In Stock
Qty	560

Qty	Price
1 - 24	$10.41286
25 - 60	$8.28296
61 - 128	$7.80964
129 - 275	$7.25745
276 +	$6.46859

C8051F321-GMR

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Technical Document