UPD75238GJ

Manufacturer Part NumberUPD75238GJ
Description4 BIT SINGLE-CHIP MICROCOMPUTER
ManufacturerNEC [NEC]
UPD75238GJ datasheet
 
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Fig. 4-15 Format of the Processor Clock Control Register
Address
Symbol
3
2
1
0
FB3H
PCC3
PCC2 PCC1
PCC0
CPU clock selection bit
(Operation with f
0
0
1
1
(Operation with f
0
0
1
1
Remarks 1. f
CPU operation mode control bits
0
0
1
1
52
PCC
= 6.0 MHz)
X
SCC = 0
( ) indicates f
= 6.0 MHz
X
CPU clock frequency
1 machine cycle
s
0
= f
/64 (93.7 kHz)
10.7 s
X
s
1
= f
/16 (375 kHz)
2.67 s
X
s
0
= f
/8 (750 kHz)
1.33 s
X
1
= f
/4 (1.5 MHz)
0.67 s
s
X
= 4.19 MHz)
X
SCC = 0
( ) indicates f
= 4.19 MHz
X
CPU clock frequency
1 machine cycle
s
0
15.3 s
= f
/64 (65.5 kHz)
X
s
1
= f
/16 (262 kHz)
3.82 s
X
s
0
= f
/8 (524 kHz)
1.91 s
X
1
0.95 s
s
= f
/4 (1.05 MHz)
X
: Output frequency from the main syem clock oscillator
X
2. f
: Output frequency from the subsyem clock oscillator
XT
0
Normal operation mode
1
HALT mode
0
STOP mode
1
Not to be set
PD75238
SCC = 1
( ) indicates f
= 32.768 kHz
XT
CPU clock frequency
1 machine cycle
s
= f
/4 (8.192 kHz)
122 s
XT
Not to be set
s
= f
/4 (8.192 kHz)
122 s
XT
SCC = 1
( ) indicates f
= 32.768 kHz
XT
CPU clock frequency
1 machine cycle
s
= f
/4 (8.192 kHz)
122 s
XT
Not to be set
s
= f
/4 (8.192 kHz)
122 s
XT