cxp85452 Sony Electronics, cxp85452 Datasheet - Page 13

• Manufacturer Part Number: cxp85452
• Description: Cmos 8-bit Single Chip Microcomputer
• Manufacturer: Sony Electronics

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Fig. 1. Clock timing
Fig. 2. Clock applied condition
AC Characteristics
(1) Clock timing
Fig. 3. Event count clock timing
1
System clock frequency
System clock input
pulse width
System clock
rise and fall times
Event count input
clock pulse width
Event count input clock
rise and fall times
t
(CPU clock selection).
t
sys indicates three values according to the contents of the clock control register (CLC: 00FE
sys (ns) = 2000/fc (Upper 2 bits = "00"), 4000/fc (Upper 2 bits = "01"), 16000/fc (Upper 2 bits = "11")
Item
EC
EXTAL
C
Symbol
f
t
t
t
t
t
t
t
t
Crystal oscillation
Ceramic oscillation
C
EXTAL
1
XL
XH
CR
CF
EH
EL
ER
EF
,
,
,
,
XTAL
EXTAL
EXTAL
EXTAL
EC
EC
XTAL
Pin
t
EH
t
XH
C
2
Fig. 1, Fig. 2
Fig. 1, Fig. 2
External clock drive
Fig 1, Fig 2
External clock drive
Fig. 3
Fig. 3
(Ta = –20 to +75°C, V
– 13 –
t
1/fc
EF
t
CF
Condition
EXTAL
t
EL
t
External clock
XL
DD
OPEN
XTAL
= 4.5 to 5.5V, Vss = 0V reference)
t
sys + 50 ∗
t
ER
t
CR
Min.
3.5
50
0.8V
0.2V
0.4V
V
DD
DD
DD
– 0.4V
1
Max.
200
20
H
CXP85452/85460
9
) upper 2 bits
MHz
Unit
ms
ns
ns
ns