CXP81840A Datasheet, PDF (16/26 Pages) Sony Corporation – CMOS 8-bit Single Chip Microcomputer

CXP81840A/81848A
AC Characteristics
(1) Clock timing
(Ta = –20 to +75°C, VDD = 3.0 to 5.5V, Vss = 0V)
Item
Symbol Pins
Conditions
Min. Max. Unit
System clock frequency
fC
XTAL
EXTAL
Fig. 1,
Fig. 2
VDD = 4.5 to 5.5V
1
16
MHz
1
12
System clock input pulse width
tXL,
tXH
EXTAL ^{Fig. 1,}
VDD = 4.5 to 5.5V 28
Fig. 2 (External clock drive)
37.5
ns
System clock input
rise and fall times
Event count clock input
pulse width
Event count clock input
rise and fall times
tCR,
tCF
EXTAL
Fig. 1, Fig. 2
(External clock drive)
tEH,
tEL
EC
Fig. 3
tER,
tEF
EC
Fig. 3
200 ns
tsys × 4^∗
ns
20 ns
System clock frequency
fC
TEX
TX
Fig. 2 VDD = 2.7 to 5.5V
32.768
(32kHz clock applied condition)
kHz
Event count clock input
pulse width
tTL,
tTH
TEX
Fig. 3
10
µs
Event count clock input
rise and fall times
tTR,
tTF
TEX
Fig. 3
20 ms
∗ _{tsys indicates three values according to the contents of the clock control register (address; 00FEH) upper 2}
bits (CPU clock selection).
tsys [ns] = 2000/fc (Upper 2-bit = "00"), 4000/fc (Upper 2-bit = "01"), 16000/fc (Upper 2-bit = "11")
Fig. 1. Clock timing
1/fc
EXTAL
VDD – 0.4V
0.4V
Fig. 2. Clock applied condition
Crystal oscillation
Ceramic oscillation
tXH
tCF
External clock
tXL
tCR
32kHz clock applying condition
crystal oscillation
EXTAL XTAL
C1
C2
EXTAL XTAL
74HC04
TEX
C1
TX
C2
– 16 –