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MB90420/5 (A) SERIES F
n Counter operation
• Reload mode
When decrementing causes an underflow (0000
continues. An underflow can issue an interrupt request, so the timer can be used as an interval timer.
Also, a toggled waveform that is inverted at every underflow can be output from the TOT0/1 pin. Table 10-
2 shows the interval time of the 16-bit reload timer.
Count Clock
Internal clock
External clock
φ: The values in parentheses are values when the machine clock is 16 MHz.
• One-shot mode
When decrementing causes an underflow (0000
generate an interrupt. During counting, a rectangular wave indicating that counting is in progress can be
output from the TOT0 and TOT1 pins.
Remarks:
1. The 16-bit reload timer can be used to generate the UART baud rate.
2. The 16-bit reload timer can be used for the A/D converter start trigger.
• 16-bit reload timer interrupt and EI
Table 10-3 shows the 16-bit reload timer interrupt and the EI
Channel
16-bit reload timer 0
16-bit reload timer 1
∆: EI
2
OS can be used when interrupt factors sharing ICR03, ICR08, or interrupt vector are not used.
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
Table 10-2 Interval Time of 16-bit Reload Timer
Count Clock Cycle
/φ (0.125 µs)
1
2
/φ (0.5 µs)
3
2
/φ (2.0 µs)
5
2
/φ (0.5 µs) or more
3
2
2
OS
Table 10-3 16-bit Reload Timer Interrupt and EI
Interrupt Control Register
Interrupt
Register
No.
Name
#17 (11
)
ICR03
H
#28 (1C
)
ICR08
H
→ FFFF
), the count setting is reloaded and the count
H
H
→ FFFF
), counting is stopped. An underflow can
H
H
2
OS.
Address of Vector Table
Address
Lower
0000B3
FFFFB8
H
0000B8
FFFF8C
H
10-4
Interval Time
0.125 µs to 8.192 ms
0.5 µs to 32.768 ms
2.0 µs to 131.1 ms
0.5 µs or more
2
OS
Upper
Bank
FFFFB9
FFFFBA
H
H
FFFF8D
FFFF8E
H
H
2
EI
OS
∆
H
∆
H
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