HC705V8GRSSLASHD datasheet(63/172 Pages) NXP

63 / 172 page

SECTION 7: POWER SUPPLY AND REGULATION

Page 52

MC68HC705V8 Specification Rev. 2.1

secondary regulator is always enabled (regardless of the mask option selection) but

consumes significantly less power than the primary regulator. The secondary regulator will

provide sufficient voltage to the control logic provided VBATT remains above the minimum

voltage.

7.2

MISCELLANEOUS REGISTER

The software power supply management functions are performed through the

MISCELLANEOUS

located

$002F.

Although

the

OCE

bit

the

MISCELLANEOUS register is unrelated to the power supply, it will be described here.

Figure 7-1:

Miscellaneous Register

7.2.1

IGNS - Ignition status bit

This is a read only status bit which indicates the state of the VIGN pin.

0 - The VIGN pin is less than the VIL level for this pin.

1 - The VIGN pin is greater than the VIH level for this pin.

WARNING: There is not hysteresis or hardware debounce on the VIGN pin and hence in the

state of this bit. This bit cannot be read unless the REGEN bit in the MOR is set.

See 17.3 DC ELECTRICAL CHARACTERISTICS for VIH and VIL levels.

7.2.2

OCE - Output compare enable

This bit controls the function of the PB6 pin.

0 - PB6 functions as a normal I/O pin.

1 - PB6 becomes the TCMP output pin for the 16-bit timer.

See SECTION 11 16-BIT TIMER for a description of the TCMP function.

Reset clears this bit.

7.2.3

PDC - Power Down Control

This bit controls the internal primary voltage regulator.

0 - Disables the internal primary voltage regulator.

1 - Enables the internal primary voltage regulator.

IGNS

MISCELLANEOUS REGISTER

$002F

PDC

UNIMPLEMENTED

READ

WRITE

ADDR

OCE

------

reset

⇒

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705V8GRS/D Datasheet(PDF) 63 Page - NXP Semiconductors

HC705V8GRS/D Datasheet(HTML) 63 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL