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1
1-14
32170/32174 Group User's Manual (Rev. 2.1)
Table 1.3.1 Description of the 32170 Pin Function (2/6)
Type
Pin Name Signal Name
Input/Output Function
Data
DB0-DB15 Data bus
Input/Output These pins comprise 16-bit data bus to connect external
devices. In write bus cycles, the valid byte positions to be
___ ___
written on the 16-bit data bus are output as BHW/BHE and
___ ___
BLW/BLE. In read cycles, data is always read from the 16-
bit data bus. However, when transferring to the internal
circuit of the M32R, only data at the valid byte positions are
transferred.
Bus
___
CS0,
Chip select
Output
These pins comprise external device chip select signal. For
control
___
CS1
areas for which a chip select signal is output, refer to
Chapter 3, "Address Space."
__
RD
Read
Output
This signal is output when reading an external device.
___ ___
BHW/BHE Byte high
Output
Indicates the byte position to which valid data is transferred
write/enable
___ ___
when writing to an external device. BHW/BHE corresponds
___ ___
BLW/BLE
Byte low
Output
___ ___
to the upper address (D0-D7 is valid); BLW/BLE
write/enable
corresponds to the lower address (D8-D15 is valid).
____
WAIT
Wait
Input
When the M32R accesses an external device, a low on this
____
WAIT input extends the wait cycle.
____
HREQ
Hold request
Input
This pin is used by an external device to request control of
____
the external bus. A low on this HREQ input causes the
M32R to enter a hold state.
____
HACK
Hold
Output
This signal is used to notify that the M32R has entered a
acknowledge
hold state and relinquished control of the external bus.
TIN 0–TIN 33 Timer input
Input
Input pins for multijunction timer.
TO 0– TO 44 Timer output
Output
Output pins for the multijunction timer.
TCLK 0– TCLK 3 Timer clock
Input
Clock input pins for the multijunction timer.
A-D
AVCC0,
Analog power supply
—
AVCC0 is the power supply for the A-D0 converter. AVCC1
converter AVCC1
is the power supply for the A-D1 converter. Connect AVCC0
and 1 to the power supply rail.
AVSS0,
Analog ground
—
AVSS0 is analog ground for the A-D0 converter. AVSS1 is
AVSS1
—
analog ground for the A-D1 converter. Connect AVSS0 and
1 to the ground.
AD0IN0
Analog input
Input
16-channel analog input pins for the A-D0 converter.
–AD0IN15
AD1IN0
16-channel analog input pins for the A-D1 converter.
–AD1IN15
OVERVIEW
1.3 Pin Function
Multi-
junction
timer