MC68340 datasheet(370/441 Pages) FREESCALE

370 / 441 page

8- 26

MC68340 USER’S MANUAL

MOTOROLA

PREL1

$60C, $64C

9876543210

PR1-15

PR1-14

PR1-13

PR1-12

PR1-11

PR1-10

PR1-9

PR1-8

PR1-7

PR1-6

PR1-5

PR1-4

PR1-3

PR1-2

PR1-1

PR1-0

RESET:

1111111111111111

Supervisor/User

For some modes of operation, this register is also used to reload the counter one falling

clock edge after a timeout occurs. Refer to 8.3 Operating Modes for more information on

the individual modes.

8.4.7 Preload 2 Register (PREL2)

PREL2 is used in addition to PREL1 in the variable duty-cycle square-wave generator and

variable-width single-shot pulse generator modes. When in either of these modes, the

value in PREL1 is loaded into the counter on the first falling edge of the counter clock after

the counter is enabled. After timeout, the value in PREL2 is loaded into the counter. This

the MCR is cleared). However, a write to this register must be completed before timeout

for the new value to be reliably loaded into the counter.

PREL2

$60E, $64E

9876543210

PR2-15

PR2-14

PR2-13

PR2-12

PR2-11

PR2-10

PR2-9

PR2-8

PR2-7

PR2-6

PR2-5

PR2-4

PR2-3

PR2-2

PR2-1

PR2-0

RESET:

1111111111111111

Supervisor/User

8.4.8 Compare Register (COM)

The COM can be used in any mode. When the 16-bit counter reaches the value in the

COM, the TC and COM bits in the SR are set. In the input capture/output compare mode,

a compare event can be programmed to set, clear, or toggle TOUTx. The register can be

be read and written when the timer module is enabled (i.e., the STP bit in the MCR is

cleared).

COM

$610, $650

9876543210

COM15 COM14 COM13 COM12 COM11 COM10

COM9

COM8

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

RESET:

0000000000000000

Supervisor/User

The COM can be used to produce an interrupt when the SR TC bit has been enabled to

produce an interrupt and the counter counts down to a preselected value. The COM can

also be used to indicate that the timer is approaching timeout.

Freescale Semiconductor, Inc.

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MC68340 Datasheet(PDF) 370 Page - Freescale Semiconductor, Inc

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