參數(shù)資料
型號: UPD75336
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(shù): 20/68頁
文件大小: 532K
代理商: UPD75336
20
μ
PD75336
5.2
CLOCK GENERATOR
Clock generator operation is determined by the processor clock control register (PCC) and the system clock
control register (SCC).
There are two types of clock: main system clock and subsystem clock.
The instruction execution time can also be changed.
0.95
μ
s/1.91
μ
s/3.81
μ
s/15.3
μ
s (main system clock: at 4.19 MHz operation)
122
μ
s (subsystem clock: at 32.768 kHz operation)
Fig. 5-1 Block Diagram of Clock Generator
Subsystem
Clock Oscil-
lation Circuit
XT1
XT2
X1
X2
V
DD
V
DD
f
XT
f
X
LCD Controller/
Driver
Watch Timer
Basic Interval Timer (BT)
Timer/Event Counter
Serial Interface
Watch Timer
LCD Controller/Driver
A/D Converter
INT0 Noise Eliminator
Clock Output Circuit
1/8 to 1/4096
Frequency Divider
1/2
S
S
Frequency
Divider
1/4
CPU
INT0 Noise Eliminator
Clock Output Circuit
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
WM. 3
SCC
PCC
4
I
Main System
Clock Oscil-
lation Circuit
R
Q
PCC0
PCC1
PCC2
PCC3
SCC3
SCC0
HALT
*
STOP
*
Φ
1/16
1/4
*
Instruction execution
Remarks
1.
2.
3.
4.
5.
6.
f
X
= Main system clock frequency
f
XT
= Subsystem clock frequency
Φ
= CPU clock
PCC: Processor clock control register
SCC: System clock control register
1 clock cycle of
Φ
(t
CY
) is 1 machine cycle of instruction. For t
CY
, refer to "AC CHARACTERISTICS"
in
10. "ELECTRICAL SPECIFICATIONS"
.
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