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Semiconductor Group 1-10

Introduction

C501

P0.0 – P0.7 43–36 39–32 37–30 I/O Port 0

is an 8-bit open-drain bidirectional I/O

port. Port 0 pins that have 1s written to

them float, and in that state can be used

as high-impedance inputs. Port 0 is also

the multiplexed low-order address and

data bus during accesses to external

program or data memory. In this

application it uses strong internal pull-up

resistors when issuing 1s.

Port 0 also outputs the code bytes during

program verification in the C501-1R and

C501-1E. External pull-up resistors are

required during program verification.

22 20 16 – Circuit ground potential

44 40 38 – Supply terminal for all operating modes

N.C. 1, 12,

23, 34

– 6, 17,

28, 39

– No connection

*) I = Input

O = Output

Table 1-1

Pin Definitions and Functions (cont’d)

Symbol Pin Number I/O*) Function

P-LCC-44 P-DIP-40 P-MQFP-44

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 120 121

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