User Manual

63
ATAR862-3
4556B–4BMCU–02/03
Timer 3 Control Register 1
(T3C) Write
Primary register address: "C"hex - Write
Timer 3 Status Register 1
(T3ST) Read
Primary register address: "C"hex - Read
Note: The status bits T3C1, T3C2 and T3ED will be reset after a READ access to T3ST.
Timer 3 Clock Select Register
(T3CS)
Address: "B"hex - Subaddress: "1"hex
Bit 3 Bit 2 Bit 1 Bit 0
Write T3EIM T3TOP T3TS T3R Reset value: 0000b
T3EIM Timer 3 Edge Interrupt Mask
T3EIM = 0, disables the interrupt when an edge event for Timer 3 occurs (T3I)
T3EIM = 1, enables the interrupt when an edge event for Timer 3 occurs (T3I)
T3TOP Timer 3 Toggle Output Preset T3TOP = 0, sets toggle output (M3) to "0"
T3TOP = 1, sets toggle output (M3) to "1"
Note: If T3R = 1, no output preset is possible
T3TS Timer 3 Toggle with Start T3TS = 0, Timer 3 output is not toggled during the start
T3TS = 1, Timer 3 output is toggled if started with T3R
T3R Timer 3 Run T3R = 0, Timer 3 stop and reset
T3R = 1, Timer 3 run
Bit 3 Bit 2 Bit 1 Bit 0
Read - - - T3ED T3C2 T3C1 Reset value: x000b
T3ED Timer 3 Edge Detect
This bit will be set by the edge-detect logic of Timer 3 input (T3I)
T3C2 Timer 3 Compare 2
This bit will be set when a match occurs between Counter 3 and T3CO2
T3C1 Timer 3 Compare 1
This bit will be set when a match occurs between Counter 3 and T3CO1
Bit 3 Bit 2 Bit 1 Bit 0
T3CS T3E1 T3E0 T3CS1 T3CS0 Reset value: 1111b
T3E1 Timer 3 Edge select bit 1 T3E1 T3E0 Timer 3 Input Edge Select (T3I)
T3E0 Timer 3 Edge select bit 0 11–
1 0 Positive edge at T3I pin
0 1 Negative edge at T3I pin
0 0 Each edge at T3I pin