M37733S4BFP Datasheet, PDF (4/36 Pages) Mitsubishi Electric Semiconductor – 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
M37733S4BFP
16-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Pin
Name Input/Output
Vcc,
Power source
Vss
CNVss
_____
RESET
CNVss input
Reset input
Input
Input
XIN
Clock input
Input
XOUT
_
E
BYTE
Clock output
Enable output
Bus width
selection input
Output
Output
Input
AVcc,
Analog power
AVss
source input
VREF
Reference
voltage input
P00/A0 – Address (low-
P07/A7 order) output
P10/A8/D8 – Address (middle
P17/A15/D15 -order)
output/data
(high-order) I/O
P20/A16/D0 – Address (high-
P27/A23/D7 order)
output/data
(low-order) I/O
_
P30/R/W Read/Write
output
___
P31/BHE Byte high
enable output
P32/ALE Address latch
enable output
____
P33/HLDA Hold acknow-
____
HOLD
___
RDY
ledge output
Hold request
input
Ready input
Input
Output
I/O
I/O
Output
Output
Output
Output
Input
Input
P42/ 1 Clock output
P43 – P47 I/O port P4
Output
I/O
P50 – P57 I/O port P5
I/O
P60 – P67 I/O port P6
I/O
P70 – P77 I/O port P7
I/O
P80 – P87 I/O port P8
I/O
Functions
Apply 5 V ± 10 % to Vcc and 0 V to Vss.
Connect to Vcc.
When “L” level is applied to this pin, the microcomputer enters the reset state.
These are pins of main-clock generating circuit. Connect a ceramic resonator or a quartz-crystal
oscillator between XIN and XOUT. When an external clock is used, the clock source should be
connected to the XIN pin, and the XOUT pin should be left open.
_
When output level of E signal is “L”, data/instruction read or data write is performed.
This pin determines whether the external data bus has an 8-bit width or a 16-bit width.
The data bus has a 16-bit width when “L” signal is input and an 8-bit width when “H” signal
is input.
Power source input pin for the A-D converter. Externally connect AVcc to Vcc and AVss to Vss.
This is reference voltage input pin for the A-D converter.
Address (A0 – A7) is output.
When the BYTE pin is set to “L” and external data bus has a 16-bit width, high-order data
(D8 – D15) is input/output or an address (A8 – A15) is output. When the BYTE pin is “H” and an
external data bus has an 8-bit width, only address (A8 – A15) is output.
Low-order data (D0 – D7) is input/output or an address (A16 – A23) is output.
“H” indicates the read status and “L” indicates the write status.
“L” is output when an odd-numbered address is accessed.
This is used to retrieve only the address from address and data multiplex signal.
This outputs “L” level when the microcomputer enters hold state after a hold request is accepted.
____
This is an input pin for HOLD request signal. The microcomputer enters into hold state while this
signal is “L”.
___
This is an input pin for RDY signal. The microcomputer enters into ready state while this signal is
“L”.
This pin outputs the clock 1.
These pins become a 5-bit I/O port. An I/O direction register is available so that each pin can be
programmed for input or output. These ports are in the input mode when reset.
In addition to having the same functions as port P4, _{_} th_{_}ese_{_}p_{_}ins also function as I/O pins for timers
A0 to A3 and input pins for key input interrupt input (KI0 – KI3).
In addition to having the same functions a_{_}s_{_}p_{_}ort _{_}P_{_}4_{_}, these pins also function as I/O pins for timer
A4, input pins for external interrupt input (INT0 – INT2) and input pins for timers B0 to B2. P67 also
functions as sub-clock SUB output pin.
In addition to having the same functions as port P4, these pins function as input pins for A-D
converter. P72 to P75 also function as I/O pins for UART2. Additionally, P76 and P77 have the
function as the output pin (XCOUT) and the input pin (XCIN) of the sub-clock (32 kHz) oscillation
circuit, respectively. When P76 and P77 are used as the XCOUT and XCIN pins, connect a resonator
or an oscillator between the both.
In addition to having the same functions as port P4, these pins also function as I/O pins for UART
0 and UART 1.
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