KS57C2308/P2308/C2316/P2316
TIMERS and TIMER/COUNTERS
11-19
TC0 COUNTER REGISTER (TCNT0)
The 8-bit counter register for timer/counter 0, TCNT0, is read-only and can be addressed by 8-bit RAM control
instructions.
RESET
sets all TCNT0 register values to logic zero (00H).
Whenever TMOD0.3 is enabled, TCNT0 is cleared to logic zero and counting resumes. TCNT0 register value is
incremented at the selected edge each time an incoming pulse with reference clock specified by TMOD0 register
(specifically, TMOD0.6, TMOD0.5, and TMOD0.4) is input.
Each time TCNT0 is incremented, the new value is compared with the reference value stored in the TC0
reference buffer, TREF0. When TCNT0 = TREF0, an match signal occurs in the comparator, the interrupt
request flag, IRQT0, is set to logic one, and an interrupt request is generated to indicate that the specified
timer/counter interval has elapsed.
COUNT
CLOCK
TCNT0
TOL0
TIMER START INSTRUCTION
(TMOD0.3 IS SET)
TREF0
REFERENCE VALUE = n
0
1
2
n-1
n
0
1
2
n-1
0
1
2
n
INTERVAL TIME
IRQT0 SET
IRQT0 SET
MATCH
MATCH
3
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
Figure 11-3. TC0 Timing Diagram
Summary of Contents for KS57C2308
Page 30: ...ADDRESS SPACES KS57C2308 P2308 C2316 P2316 2 22 NOTES ...
Page 168: ...SAM47 INSTRUCTION SET KS57C2308 P2308 C2316 P2316 5 94 NOTES ...
Page 170: ......
Page 206: ...POWER DOWN KS57C2308 P2308 C2316 P2316 8 8 NOTES ...
Page 210: ...RESET KS57C2308 P2308 C2316 P2316 9 4 NOTES ...
Page 222: ...I O PORTS KS57C2308 P2308 C2316 P2316 10 12 NOTES ...
Page 272: ...LCD CONTROLLER DRIVER KS57C2308 P2308 C2316 P2316 12 24 NOTES ...
Page 280: ...SERIAL I O INTERFACE KS57C2308 P2308 C2316 P2316 13 8 NOTES ...
Page 294: ...MECHANICAL DATA KS57C2308 P2308 C2316 P2316 15 2 NOTES ...
Page 310: ...KS57P2308 P2316 OTP KS57C2308 P2308 C2316 P2316 16 16 NOTES ...
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