參數(shù)資料
型號(hào)： M34501M4-XXXFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-BIT, MROM, MICROCONTROLLER, PDSO20
封裝： 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁(yè)數(shù)： 73/116頁(yè)
文件大?。?/td> 859K
代理商： M34501M4-XXXFP
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Rev.3.01
2005.02.07
page 6 of 112
REJ03B0104-0301
4501 Group
DEFINITION OF CLOCK AND CYCLE
q Operation source clock
The operation source clock is the source clock to operate this
product. In this product, the following clocks are used.
External ceramic resonator
External RC oscillation
Clock (f(XIN)) by the external clock
Clock (f(RING)) of the on-chip oscillator which is the internal
oscillator.
q System clock
The system clock is the basic clock for controlling this product.
The system clock is selected by the bits 2 and 3 of the clock con-
trol register MR.
Register MR
System clock
(Note 1)
f(XIN) or f(RING)
f(XIN)/2 or f(RING)/2
f(XIN)/4 or f(RING)/4
f(XIN)/8 or f(RING)/8
Table Selection of system clock
PORT FUNCTION
Port
Port D
Port P0
Port P1
Port P2
I/O
unit
1
4
2
Control
instructions
SD, RD
SZD, CLD
SCP, RCP
SNZCP
IAK, OKA
OP0A
IAP0
OP1A
IAP1
OP2A
IAP2
Control
registers
PU2, K2
PU0, K0
PU1, K1
W6, I1
PU2, K2
Q1
Output structure
N-channel open-drain
Input
Output
I/O
(4)
I/O
(4)
I/O
(4)
I/O
(2)
Remark
Pin
D0, D1
D2/C
D3/K
P00–P03
P10, P11
P12/CNTR,
P13/INT
P20/AIN0
P21/AIN1
Notes 1: The on-chip oscillator clock is f(RING), the clock by the
ceramic resonator, RC oscillation or external clock is
f(XIN).
2: The default mode is selected after system is released
from reset and is returned from RAM back-up.
MR2
0
1
0
1
MR3
0
1
Operation mode
High-speed mode
Middle-speed mode
Low-speed mode
Default mode
q Instruction clock
The instruction clock is a signal derived by dividing the system
clock by 3. The one instruction clock cycle generates the one
machine cycle.
q Machine cycle
The machine cycle is the standard cycle required to execute the
instruction.
Built-in programmable pull-up
functions
Key-on wakeup functions
(programmable)
Built-in programmable pull-up
functions
Key-on wakeup functions
(programmable)
Built-in programmable pull-up
functions
Key-on wakeup functions
(programmable)
Built-in programmable pull-up
functions
Key-on wakeup functions
(programmable)
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