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4518 Datasheet, PDF (31/160 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER | |||
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4518 Group
Table 9 Function related timers
Circuit
Structure
Count source
Prescaler
Timer 1
Timer 2
Timer 3
Timer 4
Watchdog
timer
8-bit programmable ⢠Instruction clock (INSTCK)
binary down counter
8-bit programmable ⢠Instruction clock (INSTCK)
binary down counter ⢠Prescaler output (ORCLK)
(link to INT0 input)
⢠XIN input
(period/pulse width ⢠CNTR0 input
measurement function)
8-bit programmable ⢠System clock (STCK)
binary down counter ⢠Prescaler output (ORCLK)
⢠Timer 1 underflow
(T1UDF)
⢠PWM output (PWMOUT)
8-bit programmable ⢠PWM output (PWMOUT)
binary down counter ⢠Prescaler output (ORCLK)
(link to INT1 input)
⢠Timer 2 underflow
(T2UDF)
⢠CNTR1 input
8-bit programmable ⢠XIN input
binary down counter ⢠Prescaler output (ORCLK)
(PWM output function)
16-bit fixed dividing ⢠Instruction clock (INSTCK)
frequency
Frequency
dividing ratio
1 to 256
1 to 256
1 to 256
1 to 256
1 to 256
65534
Use of output signal
⢠Timer 1, 2, 3, amd 4 count sources
⢠Timer 2 count source
⢠CNTR0 output
⢠Timer 1 interrupt
⢠Timer 3 count source
⢠CNTR0 output
⢠Timer 2 interrupt
⢠CNTR1 output control
⢠Timer 3 interrupt
⢠Timer 2, 3 count source
⢠CNTR1 output
⢠Timer 4 interrupt
⢠System reset (count twice)
⢠WDF flag decision
Control
register
PA
W1
W2
W5
W2
W3
W4
Rev.3.01 2005.06.15 page 31 of 157
REJ03B0008-0301
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