Microchip Technology dsPIC30F - Page 249

© 2004 Microchip Technology Inc. DS70059C-page 12-7
Section 12. Timers
Timers
12
Register 12-2: TxCON: Type B Time Base Register
Upper Byte:
R/W-0 U-0 R/W-0 U-0 U-0 U-0 U-0 U-0
TON
—TSIDL— — — — —
bit 15 bit 8
Lower Byte:
U-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 U-0
— TGATE TCKPS<1:0> T32 —TCS —
bit 7 bit 0
bit 15 TON: Timer On bit
When T32 =
1 (in 32-bit Timer mode):
1 = Starts 32-bit TMRx:TMRy timer pair
0 = Stops 32-bit TMRx:TMRy timer pair
When T32 =
0 (in 16-bit Timer mode):
1 = Starts 16-bit timer
0 = Stops 16-bit timer
bit 14 Unimplemented: Read as ‘0’
bit 13 TSIDL: Stop in Idle Mode bit
1 = Discontinue timer operation when device enters Idle mode
0 = Continue timer operation in Idle mode
bit 12-7 Unimplemented: Read as ‘0’
bit 6 TGATE: Timer Gated Time Accumulation Enable bit
1 = Timer gated time accumulation enabled
0 = Timer gated time accumulation disabled
(TCS must be set to logic ‘0’ when TGATE = 1)
bit 5-4 TCKPS<1:0>: Timer Input Clock Prescale Select bits
11 = 1:256 prescale value
10 = 1:64 prescale value
01 = 1:8 prescale value
00 = 1:1 prescale value
bit 3 T32: 32-bit Timer Mode Select bits
1 = TMRx and TMRy form a 32-bit timer
0 = TMRx and TMRy form separate 16-bit timer
bit 2 Unimplemented: Read as ‘0’
bit 1 TCS: Timer Clock Source Select bit
1 = External clock from pin TxCK
0 = Internal clock (F
OSC/4)
bit 0 Unimplemented: Read as ‘0’
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown