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4518 Datasheet(PDF) 32 Page - Renesas Technology Corp

Part # 4518
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  160 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4518 Datasheet(HTML) 32 Page - Renesas Technology Corp

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Rev.3.01
2005.06.15
page 32 of 157
REJ03B0008-0301
4518 Group
Fig. 25 Timer structure (1)
Division circuit
System clock (STCK)
Instruction clock
(INSTCK)
Multi-
plexer
(CMCK,
CRCK,
CYCK)
(Note 1)
MR0
1
0
ORCLK
Reload register RPS (8)
Prescaler (8)
Register B
Register A
(TABPS)
(TABPS)
(TPSAB)
PA0
MR3, MR2
01
00
10
11
INSTCK
W11, W10 (Note 3)
10
11
01
00
ORCLK
XIN
T1F
(TAB1)
(TAB1)
(T1AB)
(T1AB)
(T1AB)
(TPSAB)
(TPSAB)
On-chip oscillator
XIN
Ceramic resonance
RC oscillation
Timer 1 (8)
Timer 1
interrupt
Reload register R1 (8)
Register B Register A
Timer 1 underflow signal (
T1UDF)
Internal clock
generating circuit
(divided by 3)
Quartz-crystal
oscillation
W12
STCK
W21, W20
10
11
01
00
ORCLK
T1UDF
PWMOUT
T2F
(TAB2)
(TAB2)
(T2AB)
(T2AB)
(T2AB)
Timer 2
interrupt
Timer 2 underflow signal (T2UDF)
Timer 2 (8)
Reload register R2 (8)
Register B Register A
W22
0
1
W52
0
1
I12
0
1
P30/INT0
W13
T1UDF
I10
I13
I11
One-sided edge
detection circuit
Both edges
detection circuit
0
1
I10
S
R
Q
W51, W50
10
11
01
00
W52
One-period
generation circuit
1/16
On-chip oscillator
0
1
W62
D6/CNTR0
0
1
W60
Port D6 output
0
1
W23
1/2
T1UDF
1/2
T2UDF
(Note 2)
(TR1AB)
TR1AB:
PWMOUT:
This instruction is used to transfer the contents of
register A and register B to only reload register R1.
PWM output signal (from timer 4 output unit)
Data is set automatically from each reload
register when timer underflows
(auto-reload function).
Notes 1: When CMCK instruction is executed, ceramic resonance is selected.
When CRCK instruction is executed, RC oscillation is selected.
When CYCK instruction is executed, quartz-crystal oscillator is selected.
2: Timer 1 count start synchronous circuit is set by the valid edge of P30/INT0 pin
selected by bits 1 (I11) and 2 (I12) of register I1.
3: XIN cannot be used for the count source when bit 1 (MR1) of register MR is set
to “1” and f(XIN) oscillation is stopped.
0
1
W52
Divided by 2
Divided by 4
Divided by 8



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