M37735MHLXXXHP Datasheet, PDF (4/27 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
M37735MHLXXXHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Pin
Name Input/Output
Vcc,
Power source
Vss
CNVss CNVss input
Input
RESET
XIN
XOUT
E
Reset input
Clock input
Clock output
Enable output
Input
Input
Output
Output
BYTE
AVcc,
AVss
VREF
P00 – P07
External data
bus width
selection input
Analog power
source input
Reference
voltage input
I/O port P0
Input
Input
I/O
P10 – P17 I/O port P1
I/O
P20 – P27 I/O port P2
I/O
P30 – P33 I/O port P3
I/O
P40 – P47 I/O port P4
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 2.7 – 5.5 V to Vcc and 0 V to Vss.
This pin controls the processor mode. Connect to Vss for the single-chip mode and the memory
expansion mode, and to Vcc for the microprocessor mode.
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.
In the single-chip mode, this pin functions as the enable signal output pin which indicates the
access status in the internal bus.
In the memory expansion mode or the microprocessor mode, this pin functions as the RDE signal
output pin.
In the memory expansion mode or the microprocessor mode, 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.
In the single-chip mode, port P0 becomes an 8-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 the memory expansion mode or the microprocessor mode, these pins output CS0 – CS4,
RSMP signals, and address (A16, A17).
In the single-chip mode, these pins have the same functions as port P0. When the BYTE pin is set
to “L” in the memory expansion mode or the microprocessor mode 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.
In the single-chip mode, these pins have the same functions as port P0. In the memory expansion
mode or the microprocessor mode, low-order data (D0 – D7) is input/output or an address
(A0 – A7) is output.
In the single-chip mode, these pins have the same function as port P0. In the memory expansion
mode or the microprocessor mode, WEL, WEH, ALE, and HLDA signals are output.
In the single-chip mode, these pins have the same functions as port P0. In the memory expansion
mode or the microprocessor mode, P40, P41, and P42 become HOLD and RDY input pins, and
clock φ 1 output pin, respectively.
Functions of the other pins are the same as in the single-chip mode. However, in the memory
expansion mode, P42 also functions as an I/O port.
In addition to having the same functions as port P0 in the single-chip mode, these pins 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 as port P0 in the single-chip mode, 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 φ SUB output pin.
In addition to having the same functions as port P0 in the single-chip mode, 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 P0 in the single-chip mode, these pins also
function as I/O pins for UART 0 and UART 1.
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