4552 Datasheet, PDF (30/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4552 Group
XI N
XCIN
On-chip oscillator
Ceramic resonance
RC oscillation
Multi-
plexer
(CRCK)
Quartz-crystal oscillation
MR1, MR0
00
01
10
Division circuit
Divided by 8
Divided by 4
Divided by 2
MR3, MR2
11
10
01
00
System clock (STCK)
Internal clock
generating circuit
(divided by 3)
Instruction clock
(INSTCK)
PA0
Prescaler (8)
ORCLK
D5/INT
I13
I10
W13
T1UDF
C/CNTR
PWMOUT
ORCLK
T3UDF
0
1
W40
PWMOUT
W11, W10
00
01
10
11
W12
I12
One-sided edge ^I11
0 ^{detection circuit}
0
SQ
1
Both edges
detection circuit
1
R
(TABPS)
Reload register RPS (8)
(TPSAB) _(TPSAB) (TPSAB)
Register B Register A
(TABPS)
I10
1
0
Timer 1 (8)
(TAB1)
Reload register R1 (8)
(T1AB)
(T1AB)
(T1AB)
Register B Register A
(TAB1)
Port C output
QD
T1UDF
W41
Timer 1
T1F _interrupt
Timer 1 underflow signal
(T1UDF)
W10 W11
W12 R T
Register B Register A
(T2HAB)
XI N
ORCLK
Reload register R2H (8)
W 20
0
Reload control circuit
W 22
1/2 ₁
Timer 2 (8)
“H” interval expansion ¹
W21
(T2R2L)
0
Reload register R2L (8)
(TAB2)
(T2AB) _(T2AB) (T2AB)
Register B Register A
(TAB2)
TQ
R
T2F
PWMOD
W23
Timer 2
interrupt
Data is set automatically from each
reload register when timer underflows
(auto-reload function).
Fig. 22 Timer structure (1)
Rev.3.02 Dec 22, 2006 page 30 of 142
REJ03B0023-0302