Motorola DSP56301 - Manual (Page 350)

Programming Sheets
B -38 DSP56301 User’s Manual
Figure B-26. Timer Control/Status Register (TCSR)
Application: Date:
Programmer:
Sheet 2 of 3
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
TC3 TC1 TC0 TCIE TQIE TE
19 18 17 16 23 22 21 20
TCF TC2 PCE DO DI DIR TOF TRM INV
Timers
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
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
Output
Input
Input
Input
Input
Output
–
Output
Output
–
–
–
–
–
Internal
Internal
Internal
External
Internal
Internal
Internal
Internal
–
Internal
Internal
–
–
–
–
–
Timer
Timer Pulse
Timer Toggle
Event Counter
Input Width
Input Period
Capture
Pulse Width Modulation
Reserved
Watchdog Pulse
Watchdog Toggle
Reserved
Reserved
Reserved
Reserved
Reserved