
Semiconductor
ML670100
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6
PIN DESCRIPTIONS (Cont.)
Type
Signal
Name
I/O Direction Description
Analog-
to-digital
VREF
Input
This input is the reference voltage for the analog-to-digital
converter channels 7-0. Connect it to VDD.
converter AI[7:0]
Input
These are analog signal input pins for analog-to-digital
converter channels 7-0.
Debugg-
ing
TDI
Input
This input is the serial data input for the debugging scan circuit.
It represents a secondary function for I/O port PIO8[7].
interface TDO
Output
This output is the serial data output for the debugging scan
circuit.
It represents a secondary function for I/O port
PIO8[6].
nTRST
Input
"L" level input to this pin resets the debugging scan circuit.
It represents a secondary function for I/O port PIO8[5].
TMS
Input
This input selects the mode for the debugging scan circuit.
It represents a secondary function for I/O port PIO8[4].
TCK
Input
This input is the serial clock input for the debugging scan
circuit.
It represents a secondary function for I/O port
PIO8[3].
DBGEN
Input
"H" level input to this pin enables the CPU's debugging
function.
It represents a secondary function for I/O port
PIO8[2].
DBGRQ
Input
This input is a debugging request signal from an external
device.
It represents a secondary function for I/O port
PIO8[1].
DBGACK
Output
This output is an acknowledgment signal to a debugging
request signal from an external device. It represents a secondary
function for I/O port PIO8[0].
I/O ports PIO8[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO7[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO6[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO5[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO4[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO3[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO2[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO1[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.
PIO0[7:0]
Bidirectional These form an 8-bit I/O port. I/O directions are specified at the
bit level.