MC68HC705MC4MP datasheet(88/180 Pages) FREESCALE

88 / 180 page

16-Bit Timer

MC68HC705MC4 — Rev. 2.0

16-Bit Timer

The result obtained by an input capture will be one more than the value

of the free-running counter on the rising edge of the internal clock

preceding the external transition (see Figure 9-10). This delay is

required for internal synchronization. Resolution is affected by the

prescaler, allowing the free-running counter to increment once every

four internal clock cycles.

The contents of the free-running counter are transferred to the input

capture registers on each proper signal transition regardless of the state

of the respective input capture flag bit (ICF1, ICF2) in register TSR, the

respective flag will be set. The input capture registers always contain the

free-running counter value, which corresponds to the most recent input

capture. An interrupt can also accompany a successful input capture if

the respective input capture interrupt enable bit (ICIE) is set.

When the TCMP/TCAP1 bit of TCR is set, input capture function for

TCAP1 is inhibited.

After a read of the MSB of the input capture register pair (ICRH1,

ICRH2), counter transfers are inhibited until the respective LSB of the

minimum pulse period attainable to be determined by the time required

to execute an input capture software routine in an application.

Address:

$0019

Bit 7

654321

Bit 0

Read:

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

Write:

Reset:

Unaffected by Reset

Address:

$001A

Bit 7

654321

Bit 0

Read:

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Write:

Reset:

Unaffected by Reset

= Unimplemented

Figure 9-9. Input Capture Registers (ICRH2/ICRL2)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC705MC4MP Datasheet(PDF) 88 Page - Freescale Semiconductor, Inc

MC68HC705MC4MP Datasheet(HTML) 88 Page - Freescale Semiconductor, Inc

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 Descarga

Enlace URL