參數資料
型號: UPD754202
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 4位單晶片微控制器
文件頁數: 18/66頁
文件大?。?/td> 302K
代理商: UPD754202
18
μ
PD754202, 754202(A)
Figure 6-1. Clock Generator Block Diagram
Note
Instruction execution
Remarks 1.
f
X
: System clock frequency
Φ
= CPU clock
PCC: Processor Clock Control Register
One clock cycle (t
CY
) of the CPU clock is equal to one machine cycle of the instruction.
2.
3.
4.
X1
X2
System
clock
oscillator
Oscillation stops
1/2 1/41/16
f
X
Divider
1/4
Φ
HALT F/F
S
R
Q
S
R
Q
STOPF/F
PCC0
PCC1
PCC2
PCC3
PCC2,
PCC3
clear
HALT
Note
STOP
Note
Wait release signal from BT
Reset signal
Standby release signal from
interrupt control circuit
PCC
4
· Basic interval timer (BT)
· Timer counter
· INT0 noise eliminator
1/1 to 1/4096
· CPU
· INT0 noise
eliminator
Divider
S
I
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