參數(shù)資料
型號: MM908E626AVDWB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO54
封裝: 17.90 X 7.50 MM, 0.65 MM PITCH, LEAD FREE, PLASTIC, SOIC-54
文件頁數(shù): 28/44頁
文件大?。?/td> 833K
代理商: MM908E626AVDWB
MM908E626
RST_A
RST
IRQ_A
IRQ
VDD
VSS
VSUP[1:3]
GND[1:2]
PTC4/OSC1
PTB3/AD3
PTB4/AD4
PTA0/KBD0
PTA1/KBD1
MAX232
10k
RS232
DB-9
1
3
C1+
C1-
4
5
C2+
C2-
7
8
2
3
5
VCC
GND
16
15
2
V+
V-
6
1F
+
1F
+
1F
+
1F
2
1
3
65
4
74HC125
9.8304MHz CLOCK
VDD
DATA
CLK
VDD
10k
VDD
VTST
VSUP
47F
+
100nF
10
9
T2OUT
R2IN
T2IN
R2OUT
EVDD
4.7F
100nF
VREFL
VDDA
EVSS
VREFH
VSSA
Analog Integrated Circuit Device Data
34
Freescale Semiconductor
908E626
TYPICAL APPLICATIONS
FACTORY TRIMMING AND CALIBRATION
Figure 17. Normal Monitor Mode Circuit
Table 10 summarizes the possible configurations and the
necessary setups.
Table 10. Monitor Mode Signal Requirements and Options
Mode
IRQ RST
Reset
Vector
Serial
Communication
Mode
Selection
ICG
COP
Normal
Request
Timeout
Communication Speed
PTA0
PTA1
PTB3
PTB4
External
Clock
Bus
Frequency
Baud
Rate
Normal
Monitor
VTST VDD
X
1
0
1
OFF
disabled
9.8304
MHz
2.4576
MHz
9600
Forced
Monitor
VDD
$FFFF
(blank)
10
X
OFF
disabled
9.8304
MHz
2.4576
MHz
9600
GND
ON
disabled
Nominal
1.6MHz
Nominal
6300
User
VDD
not $FFFF
(not blank)
X
ON
enabled
Nominal
1.6MHz
Nominal
6300
Notes
1.
PTA0 must have a pull-up resistor to VDD in monitor mode
2.
External clock is a 4.9152MHz, 9.8304MHz or 19.6608MHz canned oscillator on OCS1
3.
Communication speed with external clock is depending on external clock value. Baud rate is bus frequency / 256
4.
X = don’t care
5.
VTST is a high voltage VDD + 3.5V VTST VDD + 4.5V
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