DSP56303 datasheet(273/292 Pages) FREESCALE

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Programming Sheets

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

B-29

Figure B-20. Timer Control/Status Register (TCSR)

Application:

Date:

Programmer:

Sheet 2 of 3

15 14 13 12 11 10

987

6543

210

TC3

TC1

TC0

TCIE TQIE

19 18 17 16

23 22 21 20

TCF

TC2

PCE

DIR

TOF

TRM

INV

Timers

Timer Enable Bit 0

0 = Timer Disabled

1 = Timer Enabled

Timer Overflow Interrupt Enable Bit 1

0 = Overflow Interrupts Disabled

1 = Overflow Interrupts Enabled

Inverter Bit 8

0 = 0- to-1 transitions on TIO input increment the counter,

or high pulse width measured, or high pulse output on TIO

1 = 1-to-0 transitions on TIO input increment the counter,

or low pulse width measured, or low pulse output on TIO

Timer Compare Interrupt Enable Bit 2

0 = Compare Interrupts Disabled

1 = Compare Interrupts Enabled

Timer Control/Status Register

TCSR0:$FFFF8F Read/Write

TCSR1:$FFFF8B Read/Write

TCSR2:$FFFF87 Read/Write

Reset = $000000

*= Reserved, Program as 0

Timer Reload Mode Bit 9

1 = Timer is reloaded when

selected condition occurs

0 = Timer operates as a free

running counter

Timer Overflow Flag Bit 20

0 = “1” has been written to TCSR(TOF),

or timer Overflow interrupt serviced

1 = Counter wraparound has occurred

Direction Bit 11

0 = TIO pin is input

1 = TIO pin is output

Data Output Bit 13

0 = Zero written to TIO pin

1 = One written to TIO pin

Data Input Bit 12

0 = Zero read on TIO pin

1 = One read on TIO pin

Timer Compare Flag Bit 21

0 = “1” has been written to TCSR(TCF),

or timer compare interrupt serviced

1 = Timer Compare has occurred

Prescaled Clock Enable Bit 15

0 = Clock source is CLK/2 or TIO

1 = Clock source is prescaler output

Timer Control Bits 4–7 (TC[3–0])

TC (3:0)

TIO

Clock

Mode

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

GPIO

Output

Input

Output

–

Output

–

Internal

External

Internal

–

Internal

–

Timer

Timer Pulse

Timer Toggle

Event Counter

Input Width

Input Period

Capture

Pulse Width Modulation

Reserved

Watchdog Pulse

Watchdog Toggle

Reserved

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