4518 Datasheet, PDF (35/160 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4518 Group
Timer control register W4
W43 D7/CNTR1 pin function selection bit
W42
PWM signal
“H” interval expansion function control bit
W41 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
W53
W52
W51
W50
Timer control register W5
Not used
Period measurement circuit control bit
Signal for period measurement selection
bits
at reset : 00002
at RAM back-up : state retained
0
This bit has no function, but read/write is enabled.
1
0 Stop
1 Operating
W51 W50
Count source
0 0 On-chip oscillator (f(RING/16))
0 1 CNTR0 pin input
1 0 INT0 pin input
1 1 Not available
R/W
TAW5/TW5A
Timer control register W6
at reset : 00002
at RAM back-up : state retained
W63 CNTR1 pin input count edge selection bit
0
1
W62 CNTR0 pin input count edge selection bit
0
1
W61
CNTR1 output auto-control circuit
0
selection bit
1
W60 D6/CNTR0 pin function selection bit
0
1
Note: “R” represents read enabled, and “W” represents write enabled.
Falling edge
Rising edge
Falling edge
Rising edge
CNTR1 output auto-control circuit not selected
CNTR1 output auto-control circuit selected
D6 (I/O) / CNTR0 (input)
CNTR0 (I/O) /D6 (input)
R/W
TAW6/TW6A
Rev.3.01 2005.06.15 page 35 of 157
REJ03B0008-0301