D75108CW NEC, D75108CW Datasheet - Page 21

• Manufacturer Part Number: D75108CW
• Description: Search -----> UPD75108CW
• Manufacturer: NEC

www.DataSheet4U.com
5.2
peripheral hardware. In addition, this circuit can change the instruction execution time.
*: Execution of the instruction
Remarks 1: f
The clock generator circuit generates clocks to control CPU operation modes by supplying clocks to the CPU and
• 0.95 s/1.91 s/15.3 s (operating at 4.19 MHz)
HALT*
STOP*
CLOCK GENERATOR CIRCUIT
4
2: f
3: PCC: Processor clock control register
4: One clock cycle (t
characteristics in 12. ELECTRICAL SPECIFICATIONS.
XX
X
Clears
PCC2,
PCC3
PCC0
PCC1
PCC2
PCC3
PCC
= Crystal/ceramic oscillator
= External clock frequency
X1
X2
System clock
generator
circuit
Oscillation
stops
Q
STOP F/F
CY
Fig. 5-1 Clock Generator Block Diagram
) of
R
S
is one machine cycle of an instruction. For t
f
f
XX
X
or
1/2 1/16
Frequency civider
1/8 to 1/4096
HALT F/F
S
R
Q
· Basic interval timer (BT)
· Clock output circuit
· Timer/event counter
· Serial interface
PD75104, 75106, 75108
Wait release signal from BT
RES (internal reset) signal
Standby release signal from
interrupt control circuit
CY
, refer to AC
Frequency
divider
1/4
· CPU
· Clock output
circuit
21