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5.6 Port I/O Characteristics
With the M34502T-MCU, port I/O characteristics are different from those of actual MCUs because
there is an emulation circuit in ports P0, P1, P2 and D0 to D5. Table 5.3 lists port I/O characteristics
of the M34502T-MCU.
Table 5.3 Emulation port I/O characteristics
5.7 Pullup Transistor
Since ports P0, P1, D2 and D3 contain emulation circuits, the pullup transistor in an MCU cannot be used.
For the M34502T-MCU, the pullup resistor of 51 kΩ is mounted. When it is necessary to change the
pullup resistor, replace the resistance arrays of R3 and R4.
Port
P0, P1
Input 74HC4050
Device Item Voltage (VCC)
2.0 V
4.5 V
2.0 V
4.5 V
Min.
1.5 V
3.15 V
-
-
-
-
-
-
160 Ω
70 Ω
Max.
-
-
0.5 V
1.35 V
250 µA
40 mA
0.4 V
0.7 V
-
130 Ω
Remarks
V
OH = MAX
I
OL = 16 mA
IOL = MAX
VI/O = VCC to GND
II/O ≤ 1 mA
V
I/O = VCC or GND
II/O ≤ 1 mA
VI/O = VCC to GND
II/O ≤ 1 mA
V
OH = MAX
IOL = 16 mA
IOL = MAX
96 Ω
200 Ω
10 Ω
-
1.5 V
3.15 V
-
-
-
-
-
-
-
-
0.5 V
1.35 V
250 µA
40 mA
0.4 V
0.7 V
4.75 V
2.0 V
4.5 V
4.5 V
2.0 V
4.5 V
2.0 V
4.5 V
4.75 V
V
IH
VIL
IOH
IOL
VOL
RON
RON
VIH
VIL
IOH
IOL
VOL
74LS06
74HC4066
74HC4050
74LS06
Output
Input/
output
Input
Output
P2
D
5 - D0