CXP878P60 Datasheet, PDF (17/29 Pages) Sony Corporation – CMOS 8-bit Single Chip Microcomputer

CXP878P60
AC Characteristics
(1) Clock timing
(Ta = –10 to +75°C, VDD = 4.5 to 5.5V, Vss = 0V reference)
Item
Symbol Pins
Conditions
Min. Typ. Max. Unit
System clock frequency fC
System clock input
tXL,
pulse width
tXH
System clock input
tCR,
rise and fall times
tCF
Event count clock input tEH,
pulse width
tEL
Event count clock input tER,
rise and fall times
tEF
XTAL Fig. 1,
EXTAL Fig. 2
XTAL Fig. 1,
EXTAL Fig. 2 (External clock drive)
XTAL Fig. 1, Fig. 2
EXTAL (External clock drive)
EC
Fig. 3
EC
Fig. 3
1
28
4tsys^∗1
16 MHz
ns
200 ns
ns
20 ns
System clock frequency fC
TEX Fig. 2 VDD = 2.7 to 5.5V
TX
(32kHz clock applied condition)
32.768
kHz
Event count clock input tTL,
pulse width
tTH
TEX Fig. 3
10
µs
Event count clock input tTR,
rise and fall times
tTF
TEX
Fig. 3
20 ms
∗1 _{tsys indicates three values according to the contents of the clock control register (CLC; 00FEH) upper 2 bits}
(CPU clock selection).
tsys [ns] = 2000/fc (Upper 2 bits = “00”), 4000/fc (Upper 2 bits = “01”), 16000/fc (Upper 2 bits = “11”)
Fig. 1. Clock timing
EXTAL
tXH
Fig. 2. Clock applied condition
Crystal oscillation
Ceramic oscillation
1/fc
tCF
tXL
VDD – 0.4V
0.4V
tCR
External clock
32kHz clock applied condition
crystal oscillation
EXTAL XTAL
C1
C2
EXTAL XTAL
74HC04
TEX
C1
TX
C2
Fig. 3. Event count clock timing
TEX
EC
tEH
tTH
tEF
tEL
tTF
tTL
– 17 –
0.8VDD
0.2VDD
tER
tTR