CXP84716 Datasheet, PDF (19/29 Pages) Sony Corporation – CMOS 8-bit Single Chip Microcomputer

CXP84716/84720/84724
AC Characteristics
(1) Clock timing
(Ta = –20 to +75°C, VDD = 3.0 to 5.5V, Vss = 0V reference)
Item
Symbol Pin
Conditions
Min. Typ. Max. Unit
System clock frequency _fC
System clock input pulse _tXL
width
tXH
System clock input
tCR
rise time, fall time
tCF
Event count input clock _tEH
pulse width
tEL
Event count input clock _tER
rise time, fall time
tEF
XTAL
VDD = 4.5 to 5.5V
Fig. 1, Fig. 2
1
EXTAL
1
XTAL ^{Fig. 1, Fig. 2 VDD = 4.5 to 5.5V}
EXTAL External clock drive
28
37.5
XTAL ^{Fig. 1, Fig. 2}
EXTAL External clock drive
EC0
EC1
Fig. 3
tsys + 50^∗1
EC0
EC1
Fig. 3
16
MHz
12
ns
200 ns
ns
20 ms
∗1 _{tsys indicates the three values below according to the upper two bits (CPU clock selection) of the clock}
control register (CLC: 00FEh).
tsys [ns] = 2000/fc (upper two bits = “00”), 4000/fc (upper two bits = “01”), 16000/fc (Upper two bits = “11”)
Fig. 1. Clock timing
1/fc
EXTAL
tXH
tCF
tXL
Fig. 2. Clock applied conditions
Crystal oscillation
Ceramic oscillation
EXTAL XTAL
C1
C2
External clock
EXTAL XTAL
74HC04
VDD – 0.4V (VDD = 4.5 to 5.5V)
VDD – 0.3V
0.4V (VDD = 4.5 to 5.5V)
0.3V
tCR
Fig. 3. Event count clock timing
EC0
EC1
tEH
tEF
tEL
– 19 –
0.8VDD
0.2VDD
tER