MITSUBISHI MICROCOMPUTERS
Ne
Pin
Vcc,
Vss
CNVss
_____
RESET
pro
w
d
uct
M37735S4LHP
16-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Name
Input/Output
Power source
Apply 2.7 – 5.5 V to Vcc and 0 V to Vss.
CNVss input
Reset input
Clock input
Clock output
Read enable output
Bus width
selection input
Input
Input
Input
Output
Output
Input
Functions
X
IN
X
OUT
___
RDE
BYTE
AVcc,
AVss
V
REF
Analog power
source input
Reference
voltage input
___
P0
0
/
___
– Chip selection
CS
0
P0
4
/
CS
4
output
____
P0
5
/
RSMP
Ready sampling
output
P0
6
/A
16
,
Address output
P0
7
/A
17
P1
0
/A
8
/D
8
– Address output
P1
7
/A
15
/D
15
/data (high
-order) I/O
P2
0
/A
0
/D
0
– Address output
P2
7
/A
7
/D
7
/data (low
-order) I/O
___
P3
0
/
WEL
Write enable
output
___
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 X
IN
and X
OUT
. 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.
When data/instruction read is performed, output level of
RDE
signal is “L”.
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.
___
___
Input
Output
Output
Output
I/O
When the specified external memory area is accessed,
CS
0
–
CS
4
signals are “L”.
___
The timing signal to be input to the
RDY
pin is output.
An address (A
16
, A
17
) is output.
When the BYTE pin is set to “L” and external data bus has a 16-bit width, high-order data
(D
8
– D
15
) is input/output or an address (A
8
– A
15
) is output. When the BYTE pin is “H” and an
external data bus has an 8-bit width, only address (A
8
– A
15
) is output.
Low-order data (D
0
– D
7
) is input/output or an address (A
0
– A
7
) is output.
___
I/O
Output
P3
1
/
WEH
P3
2
/ALE
____
Write enable
high output
Address latch
enable output
Hold acknow-
ledge output
Hold request
input
Ready input
Output
Output
Output
Input
Input
Output
I/O
I/O
I/O
P3
3
/
HLDA
____
When the BYTE pin is “L” and writing to an even address is performed, output level of
WEL
signal
is “L”. When the BYTE pin is “H” and writing to an even address or an odd address is performed,
___
output level of
WEL
signal is “L”.
___
When the BYTE pin is “L” and writing to an odd address is performed, output level of
WEH
signal
___
is “L”. When the BYTE pin is “H”,
WEH
signal is always “H”.
This is used to retrieve only the address from the multiplex signal which consists of address and
data.
This outputs “L” level when the microcomputer enters hold state after a hold request is accepted.
____
HOLD
___
RDY
This is an input pin for
HOLD
request signal. The microcomputer enters hold state while this
signal is “L”.
___
This is an input pin for
RDY
signal. The microcomputer enters 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,
__ __
also function as I/O pins for timers
these pins
A0 to A3 and input pins for key input interrupt input (
KI
0
–
KI
3
).
In addition to having the same functions as port
___
these pins also function as I/O pins for timer
P4,
___
A4, input pins for external interrupt input (
INT
0
–
INT
2
) and input pins for timers B0 to B2. P6
7
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. P7
2
to P7
5
also function as I/O pins for UART2. Additionally, P7
6
and P7
7
have the
function as the output pin (X
COUT
) and the input pin (X
CIN
) of the sub-clock (32 kHz) oscillation
circuit, respectively. When P7
6
and P7
7
are used as the X
COUT
and X
CIN
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.
P4
2
/
1
P4
3
– P4
7
P5
0
– P5
7
P6
0
– P6
7
Clock output
I/O port P4
I/O port P5
I/O port P6
P7
0
– P7
7
I/O port P7
I/O
P8
0
– P8
7
I/O port P8
I/O
4
RENESAS [ RENESAS TECHNOLOGY CORP ]
