參數資料
型號: UPD75116F
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機
文件頁數: 19/78頁
文件大?。?/td> 549K
代理商: UPD75116F
19
μ
PD75108,75112F,75116F
5.2
CLOCK GENERATOR
(1) Clock generator configuration
This is the circuit which generates various kinds of clock supplied to the CPU and peripheral hardware to control
the CPU operating mode.
This circuit can also change the instruction execution time.
0.95
μ
s/1.91
μ
s/15.3
μ
s (4.19 MHz operation)
Fig. 5-1 Clock Generator Block Diagram
Remarks
1.
2.
3.
4.
5.
6.
f
XX
= Crystal/ceramic oscillator frequency
f
X
= External clock frequency
Φ
= CPU Clock
*
indicates instruction execution
PCC : Processor clock control register
One
Φ
clock cycle (t
CY
) is one machine cycle. See "AC
CHARACTERISTICS" in
12. "ELECTRICAL SPECIFICATIONS"
for t
CY
.
X1
f
XX
or f
X
Basic Interval Timer (BT)
Clock Output Circuit
Timer/Event Counter
Serial Interface
Frequency Divider
1/2
S
HALT F/F
S
Wait Release Signal from BT
RESET Signal
Standby Release Signal from
Interrupt Control Circuit
STOP F/F
Q
S
R
PCC2,
PCC3
Clear
Oscil-
lation
Stop
PCC
4
I
System Clock
Oscillation
Circuit
R
Q
HALT
*
STOP
*
Frequency
Divider
1/4
CPU
Clock Output Circuit
Φ
1/16
X2
1/8 to 1/4096
PCC0
PCC1
PCC2
PCC3
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