UPD75518 NEC, UPD75518 Datasheet - Page 54

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

54
Address
FB3H
PCC3
3
PCC2 PCC1
2
1
Fig. 4-12 Format of the Processor Clock Control Register
PCC0
0
CPU clock selection bit
(Operation with f
(Operation with f
CPU operation mode control bits
Remarks 1. f
0
0
1
1
0
0
1
1
0
0
1
1
Symbol
PCC
0
1
0
1
0
1
0
1
0
1
0
1
CPU clock frequency
CPU clock frequency
Normal operation mode
HALT mode
STOP mode
Not to be set
2.
= f
= f
= f
= f
= f
= f
= f
= f
X
X
X
X
X
X
X
X
f
( ) indicates f
X
/64 (93.7 kHz)
/16 (375 kHz)
/8 (750 kHz)
/4 (1.5 MHz)
/64 (65.5 kHz)
/16 (262 kHz)
/8 (524 kHz)
/4 (1.05 MHz)
XT
( ) indicates f
: Output frequency from the main system clock oscillator
: Output frequency from the subsystem clock oscillator
X
X
= 6.0 MHz)
= 4.19 MHz)
SCC = 0
SCC = 0
X
X
= 4.19 MHz
= 6.0 MHz
1 machine cycle
1 machine cycle
10.7 s
1.33 s
3.82 s
1.91 s
0.95 s
2.67 s
0.67 s
15.3 s
s
s
s
s
s
s
s
s
CPU clock frequency
CPU clock frequency
= f
= f
= f
= f
XT
( ) indicates f
XT
XT
XT
( ) indicates f
/4 (8.192 kHz)
/4 (8.192 kHz)
/4 (8.192 kHz)
/4 (8.192 kHz)
Not to be set
Not to be set
SCC = 1
SCC = 1
XT
XT
= 32.768 kHz
= 32.768 kHz
1 machine cycle
1 machine cycle
PD75518(A)
122 s
122 s
122 s
122 s
s
s
s
s