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harman/kardon
2.2
Pin Names and Functions
The names of the input/output pins and their functions are described below.
Table 2.2.1 Pin names and functions.
Number
Pin Name
of Pins
P00 ∼ P07
AD0 ∼ AD7
P10 ∼ P17
AD8 ∼ AD15
A8 ∼ A15
P20 ∼ P27
A0 ∼ A7
A16 ∼ A23
P30
RD
P31
WR
P32
HWR
P33
WAIT
P34
BUSRQ
P35
BUSAK
P36
R
/
W
P37
BOOT
P40
CS0
P41
CS1
P42
CS2
P43
CS3
P50 ∼ P57
AN0 ∼ AN7
ADTRG
Table 2.2.1 Pin names and functions (1/3)
I/O
8
I/O
Port 0: I/O port that allows I/O to be selected at the bit level
I/O
Address and data (lower): Bits 0 to 7 of address and data bus
8
I/O
Port 1: I/O port that allows I/O to be selected at the bit level
I/O
Address and data (upper): Bits 8 to 15 for address and data bus
Output
Address: Bits 8 to 15 of address bus
8
I/O
Port 2: I/O port that allows I/O to be selected at the bit level
Output
Address: Bits 0 to 7 of address bus
Output
Address: Bits 16 to 23 of address bus
1
Output
Port 30: Output port
Output
Read: Strobe signal for reading external memory
This port output RD signal also case of reading internal-area by setting P3
<P30> = 0 and P3FC <P30F> = 1.
1
Output
Port 31: Output port
Output
Write: Strobe signal for writing data to pins AD0 to AD7
1
I/O
Port 32: I/O port (with pull-up resistor)
Output
High Write: Strobe signal for writing data to pins AD8 to AD15
1
I/O
Port 33: I/O port (with pull-up resistor)
Input
Wait: Pin used to request CPU bus wait
((1+N) WAIT mode)
1
I/O
Port 34: I/O port (with pull-up resistor)
Input
Bus Request: Signal used to request Bus Release
1
I/O
Port 35: I/O port (with pull-up resistor)
Output
Bus Acknowledge: Signal used to acknowledge Bus Release
1
I/O
Port 36: I/O port (with pull-up resistor)
Output
Read/Write: 1 represents Read or Dummy cycle; 0 represents Write cycle.
1
I/O
Port 36: I/O port (with pull-up resistor)
Input
This pin sets single boot mode.
When released reset, Single boot mode is started at P37 ＝ Low level.
1
I/O
Port 40: I/O port (with pull-up resistor)
Output
Chip Select 0: Outputs 0 when address is within specified address area
1
I/O
Port 41: I/O port (with pull-up resistor)
Output
Chip Select 1: Outputs 0 if address is within specified address area
1
I/O
Port 42: I/O port (with pull-up resistor)
Output
Chip Select 2: Outputs 0 if address is within specified address area
1
I/O
Port 43: I/O port (with pull-up resistor)
Output
Chip Select 3: Outputs 0 if address is within specified address area
8
Input
Port 5: Pin used to input port
Input
Analog input: Pin used to input to AD converter
Input
AD Trigger: Signal used to request start of AD converter (Shared with53 pin)
Functions
T5CC1
AVR 139-141-142/230 Service Manual
T5CC1
2006-03-03
Page 64 of 83
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