1
1-13
Ver.0.10
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,
CS1
Chip select
Output
These pins comprise external device chip select signal. For
control
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
___
___
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