4518 Datasheet, PDF (80/160 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4518 Group
Timer control register W3
W33 ^{Timer 3 count auto-stop circuit selection}
bit (Note 2)
at reset : 00002
at RAM back-up : state retained
0 Timer 3 count auto-stop circuit not selected
1 Timer 3 count auto-stop circuit selected
R/W
TAW3/TW3A
W32 _{Timer 3 control bit}
0 Stop (state retained)
1 Operating
W31
Timer 3 count source selection bits
W31 W30
Count source
0 0 PWM signal (PWMOUT)
0 1 Prescaler output (ORCLK)
W30
1 0 Timer 2 underflow signal (T2UDF)
1 1 CNTR1 input
Timer control register W4
W43
W42
W41
D7/CNTR1 pin function selection bit
PWM signal
“H” interval expansion function control bit
Timer 4 control bit
W40 Timer 4 count source selection bit
at reset : 00002
at RAM back-up : 00002
0
D7 (I/O) / CNTR1 (input)
1
CNTR1 (I/O) / D7 (input)
0 PWM signal “H” interval expansion function invalid
1 PWM signal “H” interval expansion function valid
0 Stop (state retained)
1 Operating
0
XIN input
1 Prescaler output (ORCLK) divided by 2
R/W
TAW4/TW4A
Timer control register W5
at reset : 00002
R/W
at RAM back-up : state retained
TAW5/TW5A
W53 Not used
0
This bit has no function, but read/write is enabled.
1
W52 Period measurement circuit control bit
0 Stop
1 Operating
W51 W50
Count source
W51
Signal for period measurement selection
0 0 On-chip oscillator (f(RING/16))
bits
0 1 CNTR0 pin input
W50
1 0 INT0 pin input
1 1 Not available
Timer control register W6
at reset : 00002
at RAM back-up : state retained
W63 CNTR1 pin input count edge selection bit
W62
W61
W60
CNTR0 pin input count edge selection bit
CNTR1 output auto-control circuit
selection bit
D6/CNTR0 pin function selection bit
0 Falling edge
1 Rising edge
0 Falling edge
1 Rising edge
0 CNTR1 output auto-control circuit not selected
1 CNTR1 output auto-control circuit selected
0 D6 (I/O) / CNTR0 (input)
1 CNTR0 (I/O) /D6 (input)
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: This function is valid only when the timer 3 count start synchronous circuit is selected (I20=“1”).
R/W
TAW6/TW6A
Rev.3.01 2005.06.15 page 80 of 157
REJ03B0008-0301