UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 194

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

192
(b)
Parity types and operation
The parity bit is used to detect a bit error in the communication data. Normally, the same kind of parity
bit is used on the transmitting side and the receiving side. With even parity and odd parity, a “1” bit (odd
number) error can be detected. With 0 parity and no parity, an error cannot be detected.
(i)
(ii)
(iii) 0 Parity
(iv) No parity
Even parity
Odd parity
A parity bit is not added to the transmit data. At reception, data is received assuming that there is
no parity bit. Since there is no parity bit, a parity error does not occur.
When transmitting, the parity bit is set to 0 irrespective of the transmit data.
At reception, a parity bit check is not performed.
irrespective of whether the parity bit is set to 0 or 1.
At transmission
The transmission operation is controlled so that the number of bits with a value of 1 in the
transmit data including the parity bit may be even. The parity bit value should be as follows.
The number of bits with a value of 1 is an odd number in transmit data:
The number of bits with a value of 1 is an even number in transmit data:
At reception
The number of bits with a value of 1 in the receive data including the parity bit is counted, and if
the number is odd, a parity error occurs.
At transmission
Conversely to even parity, the transmission operation is controlled so that the number of bits with
a value of 1 in the transmit data including the parity bit may be odd. The parity bit value should
be as follows.
The number of bits with a value of 1 is an odd number in transmit data:
The number of bits with a value of 1 is an even number in transmit data:
At reception
The number of bits with a value of 1 in the receive data including the parity bit is counted, and if
the number is even, a parity error occurs.
CHAPTER 13 SERIAL INTERFACE 00
User’s Manual U13952EJ3V1UD
Therefore, a parity error does not occur,
1
0
0
1