mpc89x54a Megawin Technology, mpc89x54a Datasheet - Page 19

• Manufacturer Part Number: mpc89x54a
• Description: 8-bit Micro-controller
• Manufacturer: Megawin Technology

Auto-Reload Up-Only Mode (ARUO)
In ARUO mode, Timer2 can be configured to count up with a software-defined value to be
reloaded. When reset is applied to the DCEN =0 and CP/RL2=0, Timer2 is at ARUO mode. An
overflow on Timer2 or 1-to-0 transition on T2EX pin will load RCAP2H and RCAP2L contents
onto Timer2, also set TF2 and EXF2, respectively.
Auto-Reload Up-Down Mode (ARUD)
In ARUD mode, Timer2 can be configured to count up or down. When DCEN =1 and
CP/RL2=0, Timer2 is at ARUD mode. The counting direction is determined by T2EX pin. If
T2EX=1, counting up, otherwise counting down. An overflow on Timer2 will set TF2 and toggle
EXF2. EXF2 cannot generate interrupt request in this mode. If the counting direction is DOWN,
the overflow loads 0xFFFF onto Timer2 and if counting direction is UP, the overflow loads
RCAP2H, RCAP2L contents onto Timer2.
OSC/12
MEGAWIN
T2EX pin
T2 pin
C//T2
OSC/12
TR2
T2 pin
C//T2
1
0
0
1
TR2
1
0
EXEN2
0
1
MPC89x54A Data Sheet
RCAP2L [7:0]
TL2 [7:0]
FFH
RCAP2L [7:0]
RCAP2H [7:0]
TL2 [7:0]
TH2[7:0]
FFH
RCAP2H [7:0]
TH2[7:0]
T2EX pin
EXF2
TF2
EXF2
TF2
Interrupt
Interrupt
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