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參數(shù)資料
| 型號(hào)： | M37641M8-XXXFP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 66/149頁(yè) |
| 文件大?。?/td> | 1997K |
| 代理商： | M37641M8-XXXFP |
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66
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
FREQUENCY SYNTHESIZER (PLL)
The frequency synthesizer generates the 48 MHz clock required
by f
USB
and f
SYN
, which are multiples of the external input refer-
ence f(X
IN
). Figure 59 shows the block diagram for the frequency
synthesizer circuit.
The Frequency Synthesizer Input Bit selects either f(X
IN
) or
f(X
CIN
) as an input clock f
IN
for the frequency synthesizer.
The Frequency Synthesizer Multiply Register 2 (FSM2: address
006E
16
) divides f
IN
to generate f
PIN
, where
f
PIN
= f
IN
/ 2(n + 1), n: value set to FSM2.
When the value of Frequency Synthesizer Multiply Register 2 is
set to 255, the division is not performed and f
PIN
will equal f
IN
.
f
VCO
is generated according to the contents of Frequency Synthe-
sizer Multiply Register 1 (FSM1: address 006D
16
), where
f
VCO
= f
PIN
{2(n + 1)}, n: value set to FSM1.
Set the value of FSM1 so that the value of f
VCO
is 48 MHz.
f
SYN
is generated according to the contents of the Frequency Syn-
thesizer Divide Register (FSD: address 006F
16
), where
f
SYN
= f
VCO
/ 2(m + 1), m: value set to FSD.
When the value of the Frequency Synthesizer Divide Register is
set to 255, the division is not performed and f
SYN
becomes invalid.
[Frequency Synthesizer Control Register] FSC
Setting the Frequency Synthesizer Enable Bit (FSE) to
“
1
”
enables
the frequency synthesizer. When the Frequency Synthesizer Lock
Status Bit (LS) is
“
1
”
in the frequency synthesizer enabled, this in-
dicates that f
SYN
and f
VCO
have correct frequencies.
I
Notes
Make sure to connect a low-pulse filter to the LPF pin when using
the frequency synthesizer. In addition, please refer to
“
Program-
ming Notes: Frequency Synthesizer
”
when recovering from a
Hardware Reset.
F
S
M
2
(a
D
a
t
a
B
u
s
FSM1
F
S
C
P
r
e
s
c
a
l
e
r
f
IN
f
PIN
f
VCO
f
SYN
f
USB
d
d
r
e
s
s
0
0
6
E
1
6
)
(address 006D
16
)
(a
d
d
r
e
s
s
0
0
6
C
1
6
)
(a
d
d
r
e
s
s
0
0
6
F
1
6
)
F
S
D
Frequency
Multiplier
Frequency Divider
F
e
r
q
u
n
c
y
s
y
n
t
h
e
s
i
z
e
r
l
o
k
s
t
a
t
s
b
i
t
Fig. 59 Frequency synthesizer block diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37641M8 | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8HP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641M8-100FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641M8-XXXHP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37641M8-XXXHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M376420RS | 制造商:OKI 功能描述:3764-20 NOTES |
| M3764-20RS | 制造商:OKI 功能描述:3764-20 NOTES 制造商: 功能描述:Dynamic RAM, Page Mode, 64K x 1, 16 Pin, Plastic, DIP 制造商:OK International 功能描述:Dynamic RAM, Page Mode, 64K x 1, 16 Pin, Plastic, DIP |
| M3-7643A-S | 制造商:Harris Corporation 功能描述: |
| M37643F8E8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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