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參數(shù)資料
| 型號(hào)： | 4571 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機(jī)的CMOS |
| 文件頁(yè)數(shù)： | 83/126頁(yè) |
| 文件大?。?/td> | 1627K |
| 代理商： | 4571 |
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Rev.1.02
May 25, 2007
Page 6 of 124
REJ03B0179-0102
4571 Group
PORT FUNCTION
DEFINITION OF CLOCK AND CYCLE
Operation source clock
The operation source clock is the source clock to operate this
product. In this product, the following clocks are used.
Clock (f(XIN)) by the external ceramic resonator
Clock (f(XIN)) by the external input
System clock
The system clock is the basic clock for controlling this product.
The system clock is selected by the register MR.
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.
Machine cycle
The machine cycle is the standard cycle required to execute the
instruction.
Note 1.The frequency divided by 8 is selected after system is
released from reset.
Table 5
Port function
Port
Pin
Input
Output
structure
I/O unit
Control
instructions
Control
registers
Remark
Port D
D0
D3
I/O
(5)
N-channel
open-drain/
CMOS
1 bit
SD, RD
SZD, CLD
FR1
Programmable output
structure selection function
D4/CNTR0
N-channel
open-drain
W1
W2
W5
Port P0
P00
P01
P02
P03
I/O
(4)
N-channel
open-drain
4 bits
OP0A
IAP0
PU0
K0
Programmable pull-up and
key-on wakeup function
Port P1
P10
P11
P12
P13
I/O
(4)
N-channel
open-drain
4 bits
OP1A
IAP1
PU1
K1
Programmable pull-up and
key-on wakeup function
Port P2
P20/INT0
P21/INT1
I/O
(2)
N-channel
open-drain
2 bits
OP2A
IAP2
PU2
K2, I1, I2, L1
Programmable pull-up and
key-on wakeup function
Port P3
P30
P31
I/O
(2)
N-channel
open-drain/
CMOS
2 bits
OP3A
IAP3
FR0
Programmable output
structure selection function
Port C
C/CNTR1
Output
(1)
CMOS
1 bit
RCP
SCP
W1, W3, W5
Port K
K
Input
(1)
-
1 bit
IAK
K2
Programmable key-on
wakeup function
Table 6
Table Selection of system clock
Register MR
System clock
Operation mode
MR3
MR2
1
f(STCK) = f(XIN)/8
Frequency divided by 8 mode
1
0
f(STCK) = f(XIN)/4
Frequency divided by 4 mode
0
1
f(STCK) = f(XIN)/2
Frequency divided by 2 mode
0
f(STCK) = f(XIN)
Frequency through mode
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|---|---|
| 4571_08 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Standard Characteristics |
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