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DS89C420-QCL Datasheet, PDF (105/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide
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Ultra-High-Speed Flash
Microcontroller User’s Guide
EXTERNAL OSCILLATOR
T2M = CKCON.5
DIVIDE-
BY-12
0
T2MH = CKMOD.5
INPUT TO TIMER
CLK MODE SYSCLK
DIVIDE-BY-1 OSC / 1
2X
OSC / 0.5
4X
OSC / 0.25
T2 = P1.0
TR2 = T2CON.2
T2EX = P1.1
EXEN2 = T2CON.3
DIVIDE- 1
BY-4
0
1
C / T2 = T2CON.1
0
CLK
0
TL2
78
15
TH2
TF2 =
T2CON.7
1
CAPTURE
RCAP2L RCAP2H
0
78
15
EXF2 =
T2CON.6
TIMER 2
INTERRUPT
NOTE: FOR POWER-MANAGEMENT MODE (DIVIDE-BY-1024) OPERATION, THE TIMER INPUT CLOCK TO THE TIMER IS
OSC / 1024 IF EITHER TXM = 1 OR TXMH = 1. OTHERWISE, THE TIMER INPUT IS OSC / 3072.
Figure 11-4. Timer/Counter 2 with Optional Capture (CP/RL2 = 1)
EXTERNAL OSCILLATOR
INPUT TO TIMER
CLK MODE SYSCLK
DIVIDE-BY-1 OSC / 1
2X
OSC / 0.5
4X
OSC / 0.25
T2 = P1.0
TR2 = T2CON.2
T2EX = P1.1
EXEN2 = T2CON.3
DIVIDE-
BY-12
T2M = CKCON.5
0
T2MH = CKMOD.5
DIVIDE- 1
0
BY-4
1
C / T2 = T2CON.1
0
CLK 0
78
15
TL2
TH2
1
TF2 =
T2CON.7
RCAP2L RCAP2H
0
78
15
EXF2 =
T2CON.6
TIMER 2
INTERRUPT
NOTE: FOR POWER-MANAGEMENT MODE (DIVIDE-BY-1024) OPERATION, THE TIMER INPUT CLOCK TO THE TIMER IS
OSC / 1024 IF EITHER TXM = 1 OR TXMH = 1. OTHERWISE, THE TIMER INPUT IS OSC / 3072.
Figure 11-5. Timer/Counter 2 Autoreload Mode (CP/RL2 = 0, DCEN = 0)
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