MB89620 series
CHAPTER 9 16-BIT TIMER/COUNTER
183
l
Count clock selector
Selects the internal count clock (1 t
inst
) for the interval timer function or the output of the edge
detector for the counter function. The 16-bit counter (TCR register) uses the selected signal as
the count-up clock.
l
Edge detector
Operates when the counter function is selected, and detects rising, falling, or both edges of
pulses input from the EC pin.
l
TCR register
This 16-bit counter counts-up from the value set in the register. The counter function sets the
interrupt request flag bit (TCEF = “1”) in the TMCR register when the counter value overflows.
l
TMCR register
The TMCR register is used to select the function, enable or disable operation, control interrupts,
and check the timer/counter status.
l
Lower 8-bit latch
Stores the lower 8 bits of the 16-bit counter whenever a read occurs for the upper 8 bits of the
TCR register (TCHR). As the lower 8 bits of the counter (TCLR) are read from the lower 8-bit
latch, the correct 16-bit counter value can be read even if the counter is counting up.
Check:
Reading the lower 8 bits followed by the upper 8 bits of the TCR register while the counter is
operating may result in an incorrect value being read if a counter carry occurs.
Therefore, always use word transfer instructions to read the TCR register.
Summary of Contents for F2MC-8L MB89620 Series
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Page 122: ...MB89620 series CHAPTER 4 I O PORTS 101 Memo ...
Page 144: ...MB89620 series CHAPTER 5 TIMEBASE TIMER 123 Memo ...
Page 149: ...128 CHAPTER 5 TIMEBASE TIMER MB89620 series ...
Page 157: ...136 CHAPTER 6 WATCHDOG TIMER MB89620 series ...
Page 174: ...MB89620 series CHAPTER 7 8 BIT PWM TIMER 153 Memo ...
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Page 202: ...MB89620 series CHAPTER 9 16 BIT TIMER COUNTER 181 Memo ...
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Page 220: ...MB89620 series CHAPTER 10 8 BIT SERIAL I O SERIAL I O 1 AND SERIAL I O 2 199 Memo ...
Page 228: ...MB89620 series CHAPTER 10 8 BIT SERIAL I O SERIAL I O 1 AND SERIAL I O 2 207 Memo ...
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Page 289: ...268 CHAPTER 14 CLOCK MONITOR FUNCTION MB89620 series ...
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