cxp81952 Sony Electronics, cxp81952 Datasheet - Page 17

• Manufacturer Part Number: cxp81952
• Description: Cmos 8-bit Single Chip Microcomputer
• Manufacturer: Sony Electronics

AC Characteristics
(1) Clock timing
Fig. 1. Clock timing
Fig. 2. Clock applied condition
Fig. 3. Event count clock timing
System clock frequency
System clock input
pulse width
System clock input
rise and fall times
Event count clock input
pulse width
Event count clock input
rise and fall times
System clock frequency
Event count clock input
pulse width
Event count clock input
rise and fall times
t
bits (CPU clock selection).
t
sys indicates three values according to the contents of the clock control register (address; 00FE
sys [ns] = 2000/fc (Upper 2 bits = "00"), 4000/fc (Upper 2 bits = "01"), 16000/fc (Upper 2 bits = "11")
TEX
EC
EXTAL
Item
C
Crystal oscillation
Ceramic oscillation
EXTAL
1
XTAL
Symbol
f
t
t
t
t
t
t
t
t
f
t
t
t
t
C
C
XL
XH
CR
CF
EH
EL
ER
EF
TL
TH
TR
TF
,
,
,
C
,
,
,
2
XTAL
EXTAL
XTAL
EXTAL
XTAL
EXTAL
EC
EC
TEX
TX
TEX
TEX
t
t
EH
TH
Pins
t
XH
EXTAL
Fig. 1,
Fig. 2
Fig. 1,
Fig. 2 (External clock drive)
Fig. 1, Fig. 2
(External clock drive)
Fig. 3
Fig. 3
Fig. 2
(32kHz clock applied condition)
Fig. 3
Fig. 3
External clock
74HC04
t
t
EF
TF
1/fc
t
– 17 –
CF
XTAL
V
DD
= 2.7 to 5.5V
Conditions
(Ta = –20 to +75°C, V
t
t
EL
TL
t
XL
32kHz clock applied condition
crystal oscillation
V
V
C
DD
DD
1
TEX
= 4.5 to 5.5V
= 4.5 to 5.5V
t
t
ER
TR
t
CR
0.8V
0.2V
TX
0.4V
V
DD
C
DD
DD
DD
2
– 0.4V
= 3.0 to 5.5V, Vss = 0V)
t
sys 4
32.768
37.5
Min.
28
10
1
1
CXP81952/81960
Max.
200
16
12
20
20
H
) upper 2
MHz
kHz
Unit
ms
ns
ns
ns
ns
µs