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參數(shù)資料
| 型號(hào)： | M37920S4CGP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | 16 BIT CMOS MICROCOMPUTER |
| 中文描述： | 16位CMOS微機(jī) |
| 文件頁數(shù)： | 4/39頁 |
| 文件大?。?/td> | 438K |
| 代理商： | M37920S4CGP |
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PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
M37920S4CGP
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
4
Vcc, Vss
MD0
MD1
RESET
X
IN
X
OUT
BYTE
AVcc,
AVss
V
REF
A
0
–A
7
A
8
–A
15
/
MA
0
–MA
7
A
16
–A
23
/
MA
8
–MA
11
D
0
–D
7
P2
0
/D
8
–
P2
7
/D
15
P3
0
/RDY,
RD,
BLW,
P3
3
/BHW
P4
0
/ALE,
P4
1
/
φ
1
,
P4
2
/TC,
P4
3
/HOLD,
P4
4
/HLDA
P5
0
–P5
7
P6
0
–P6
6
Power supply input
MD0
MD1
Reset input
Clock input
Clock output
External data bus width
select input
Analog power supply input
Reference voltage input
Low-order address
Middle-order address/
DRAM address
High-order address/
DRAM address
Low-order data
I/O port P2/
High-order data
Memory control signal I/O
I/O port P4
I/O port P5
I/O port P6
—
Input
Input
Input
Input
Output
Input
—
Input
Output
Output
Output
I/O
I/O
Input
Output
Output
Output
Output
Output
I/O
Input
Output
I/O
I/O
Apply 5 V±10 % to Vcc, and 0 V to Vss.
This pin controls the processor mode. Connect this pin to V
CC
.
Connect this pin to Vss.
The microcomputer is reset when “L” level is applies to this pin.
These are input and output pins of the internal clock generating circuit. Connect a
ceramic or quartz- crystal resonator between the X
IN
and X
OUT
pins. When an
external clock is used, the clock source should be connected to the X
IN
pin, and the
X
OUT
pin should be left open.
This pin determines whether the external data bus has an 8-bit width or 16-bit width
for the memory expansion mode or microprocessor mode. The width is 16 bits when
“L” signal is input, and 8 bits when “H” signal is input.
Power supply input pin for the A-D converter. Connect AVcc to Vcc, and AVss to Vss
externally.
This is the reference voltage input pin for the A-D converter.
The low-order 8 bits of address (A
0
–A
7
) are output.
The middle-order 8 bits of address (A
8
–A
15
) are input/output. While DRAM space is
accessed, multiplexed address (MA
0
–MA
7
) is output.
The high-order 8 bits of address (A
16
–A
23
) are output. While DRAM space is ac-
cessed, multiplexed address (MA
8
–MA
11
) is output.
The low-order 8 bits of data (D
0
–D
7
) are input/output.
I
When 8-bit external data bus is used (BYTE = “H” level)
Port P2 is an 8-bit I/O port.
I
When 16-bit external data bus is used (BYTE = “L” level)
The high-order 8 bits (D
8
–D
15
) are input/output.
While the input level at pin RDY is “L”, the microcomputer is placed in the ready
state. While pin RD is at “L” level, the microcomputer reads out data and instruc-
tion codes. Also, pin RDY can function as a programmable I/O port pin (P3
0
) by
software.
I
When 8-bit external data bus is used (BYTE = “H” level)
While pin BLW is at “L” level, the microcomputer writes data.
I
When 16-bit external data bus is used (BYTE = “L” level)
While pin BLW is at “L” level, the microcomputer writes data into an even-
numbered address.
While pin BHW is at “L” level, the microcomputer writes data into an odd-
numbered address.
Signal ALE is used to latch an address.
φ
1
has the same period as internal clock
φ
.
Pin P4
2
functions as a programmable I/O port pin.
While the input level at pin HOLD is at “L” level, the microcomputer is placed in the
hold state. Signal HLDA is used to inform the external that the microcomputer
enters the hold state. By software, pin ALE, clock
φ
1
output pin, and pins HOLD,
HLDA function as programmable I/O port pins (P4
0
, P4
1
, P4
3
, P4
4
). Pin P4
2
also
functions as pin TC.
Port P5 is an 8-bit I/O port. These pins also function as I/O pins for timers A0, A2,
and pulse output pins for the real-time output.
Port P6 is a 7-bit I/O port. These pins also function as I/O pins for timers A1, A3,
A4, input pins for DMA requests, and output pins for DMA acknowledge signals.
PIN DESCRIPTION (Microcomputer mode)
Functions
Input/
Output
Name
Pin
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