參數(shù)資料
型號(hào)： UPD75212ACW
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 18/70頁(yè)
文件大?。?/td> 516K
代理商： UPD75212ACW
18
μ
PD75212A
5.2
CLOCK GENERATOR
The clock generator operations are determined by the processor clock control register (PCC) and the system clock
control register (SCC).
The clock generator has two types: main system clock and subsystem clock.
The instruction execution time can be changed.
0.95
μ
s, 1.91
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 Clock Generator Block Diagram
XT1
XT2
X1
X2
f
XT
f
X
SCC
PCC
HALT
*
STOP
*
HALT F/F
STOP F/F
Q
4
S
R
S
R
1/4
1/8~1/4096
SCC3
SCC0
PCC0
PCC1
PCC2
PCC3
Q
S
f
XX
1/21/6
Frequency Divider
S
Watch Timer
Timer/Pulse
Generator
Subsystem
Clock
Oscillator
Main System
Clock
Oscillator
Oscillation
Stop
Frequency
Divider
FIP Controller
Basic Interval Timer (BT)
Timer/Event Counter
Serial Interface
Watch Timer
INT0 Noise Eliminator
CPU
INT0 Noise Eliminator
INT1 Noise Eliminator
Φ
Wait Release Signal from BT
RES Signal (Internal Reset)
Standby Release Signal from
Interrupt Control Circuit
PCC2 and
PCC3
Clear
I
*
Instruction execution
Remarks
1.
2.
3.
4.
5.
6.
7.
f
X
= Main system clock frequency
f
XT
= Subsystem clock frequency
f
XX
= System clock frequency
Φ
= CPU clock
PCC: Processor clock control register
SCC: System clock control register
1 clock cycle (t
CY
) of
Φ
is 1 machine cycle of an instruction. For t
CY
, see ”AC Characteristics“ in
12.
ELECTRICAL SPECIFICATIONS.
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