UPD78C18 datasheet(25/110 Pages) NEC

25 / 110 page

µPD78C17,78C18

MCCn = 1

MCn = x

MCCn = 0

Output

MCn = 1

Input

TXD output

RXD inpit

SCK input/output

INT2/TI input

TO output

CI input

CO0 output

CO1 output

PC0

PC1

PC2

PC3

PC4

PC5

PC6

PC7

(3)

PC7 to PC0 (PORT C)

Port C (PC7 to PC0) is an 8-bit special input/output port which functions as various control signals as

well as general-purpose input/output ports in which input/output is set bit-wise like port A. These are

switched over bit-wise according to the setting of the MODE C register and MODE CONTROL C register as

shown below.

Table 2-2 Operation of PC7 to PC0

(n = 0 to 7)

µPD78C18 port C pull-up resistor specification is performed bit-wise by mask option.

In the operation when data is set in the general-purpose input/output ports, as with port A, direct bit

setting/resetting/testing of port C output latch contents is possible by an arithmetic or logical operation

instruction without the use of an accumulator. Data transfer to/from an accumulator is also possible.

•

MODE CONTROL C Register (MCC)

8-bit register which specifies the port C port/ control signal input/output mode bit-wise.

If the MODE CONTROL C register corresponding bits are set (1), PC7 to PC0 are in the control signal

input/output mode, and if these are reset (0), in the port mode.

After RESET input or in the hardware STOP mode, all the bits of the MODE CONTROL C register are

reset (0), and the port mode is set.

UPD78C18 Datasheet(PDF) 25 Page - NEC

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