參數(shù)資料
型號： M37640E8
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述： 單芯片8位CMOS單片機
文件頁數(shù)： 24/172頁
文件大?。?/td> 1193K
代理商： M37640E8
2-12
7/9/98
Oscillator Circuit
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
Figure 2-10. Frequency Synthesizer Multiply Control register FSM1
Figure 2-11. Frequency Synthesizer Divide Register
The relationship between f
PIN
, f
VCO
, and f
SYN
is as follows:
f
VCO
= f
PIN
x 2(
n
+1) where
n
is the decimal equivalent of the value loaded in FSM2, FSM1.
Note:
n
must be chosen such that f
VCO
equals 48 MHz.
f
SYN
= f
VCO
/ 2(m+1) where m is the decimal equivalent of the value loaded in FSD
Note:
Setting m = 255 disables the divider and disables f
SYN
.
The FSC0 bit in the FSC Control Register enables the frequency synthesizer block. When disabled
(FSC0 = “0”), f
VCO
is held at either a high or low state. When the frequency synthesizer control bit is
active (FSC0 = “1”), a lock status (LS = “1”) indicates that f
SYN
and f
VCO
are the correct frequency.
The LS and FSCO control bits in the FSC Control register are shown in Figure 2-12.
When using the frequency synthesizer, a low-pass filter must be connected to the LPF pin.
Once the frequency synthesizer is enabled, a delay of 2-5ms is recommended before the output of the
frequency synthesizer is used. This is done to allow the output to stabilize. It is also recommended that
none of the registers be modified once the frequency synthesizer is enabled as it will cause the output
to be temporarily (2-5ms) unstable.
f
VCO
/2(
n
+1) = f
PIN
f
PIN
FSM1
f
VCO
Dec(n)
Hex(n)
320 kHz
74
4A
48.00 MHz
2 MHz
11
0B
48.00 MHz
4 MHz
5
05
48.00 MHz
6 MHz
3
03
48.00 MHz
12 MHz
1
01
48.00 MHz
24 MHz
0
00
48.00 MHz
MSB
7
LSB
0
Bit 6
Bit 1
Bit 0
Bit 2
Bit 5
Bit 4
Bit 3
Bit 7
Address: 006D
16
Access: R/W
Reset: FF
16
f
VCO
/2(m+1) = f
SYN
f
VCO
FSD
f
SYN
Dec(m)
Hex(m)
48.00 MHz
00
00
24.00 MHz
48.00 MHz
127
7F
187.50 KHz
MSB
7
LSB
0
Bit 6
Bit 1
Bit 0
Address: 006F
16
Access: R/W
Reset: FF
16
Bit 2
Bit 5
Bit 4
Bit 3
Bit 7
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