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CHAPTER 1 OVERVIEW
1.8 I/O Circuit Types

Table 1.8-1 describes the I/O circuit types.

The letters in the circuit column shown in Table 1.8-1 correspond to the letters in the

circuit type column shown in Table 1.7-1 .

■I/O Circuit Types
Table 1.8-1 I/O Circuit Types (1/2)
Types Circuit Remarks
A At an oscillation feedback resistance of
approximately 500 kΩ
B CMOS output
Hysteresis input
Pull-up resistor optional
C At an output pull-up resistor (P-ch) of
approximately 50 kΩ/5.0 V
(not available for MB89F202/F202RA)
N-ch open-drain reset output
Hysteresis input
High voltage input tolerable in MB90F202RA
X1
Standby control signal
X0
P-ch
N-ch
P-ch
Input enable Port / Resource
P-ch with pull-up, not
available for
MB89F202/F202RA
N-ch
Reset