UPD75218 NEC, UPD75218 Datasheet - Page 48
UPD75218
Manufacturer Part Number
UPD75218
Description
4-BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC
Datasheet
1.UPD75218.pdf
(62 pages)
- Current page: 48 of 62
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48
Notes 1.
2. Current to the on-chip pull-down resistor (mask option) is not included.
3. When the processor clock control register (PCC) is set to 0011 and is operated in the high-speed mode.
4. When the PCC register is set to 0000 and is operated in the low-speed mode.
5. When the system clock control register (SCC) is set to 1001 and is operated with the subsystem clock
The following external circuit is recommended.
with main system clock oscillation stopped.
PD75218
V
V
LOAD
V
V
PRE
DD
SS
RD9. 1EL
68 k
RD9. 1EL : Zener diode (NEC)
+5 V
–30 V
Zener voltage = 8.29 to 9.30 V
PD75218
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