Epson S1C63558 - Manual (Page 105)

S1C63558 TECHNICAL MANUAL EPSON 95
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Serial Interface)
EPR: Serial interface (1) parity enable register (FF71H•D3)
EPRS: Serial interface (2) parity enable register (FF59H•D3)
Selects the parity function.
When "1" is written: With parity
When "0" is written: Non parity
Reading: Valid
Selects whether or not to check parity of the received data and to add a parity bit to the transmitting data.
When "1" is written to EPR/EPRS, the most significant bit of the received data is considered to be the
parity bit and a parity check is executed. A parity bit is added to the transmitting data. When "0" is
written, neither checking is done nor is a parity bit added.
Parity is valid only in asynchronous mode and the EPR/EPRS setting becomes invalid in the clock
synchronous mode.
At initial reset, this register is set to "0".
PMD: Serial interface (1) parity mode selection register (FF71H•D2)
PMDS: Serial interface (2) parity mode selection register (FF59H•D2)
Selects odd parity/even parity.
When "1" is written: Odd parity
When "0" is written: Even parity
Reading: Valid
When "1" is written to PMD/PMDS, odd parity is selected and even parity is selected when "0" is written.
The parity check and addition of a parity bit is only valid when "1" has been written to EPR/EPRS. When
"0" has been written to EPR/EPRS, the parity setting by PMD/PMDS becomes invalid.
At initial reset, this register is set to "0".
TXEN: Serial interface (1) transmit enable register (FF72H•D0)
TXENS: Serial interface (2) transmit enable register (FF5AH•D0)
Sets the serial interface to the transmit enabled status.
When "1" is written: Transmit enabled
When "0" is written: Transmit disabled
Reading: Valid
When "1" is written to TXEN/TXENS, the serial interface shifts to the transmit enabled status and shifts
to the transmit disabled status when "0" is written.
Set TXEN/TXENS to "0" when making the initial settings of the serial interface and similar operations.
At initial reset, this register is set to "0".
TXTRG: Serial interface (1) transmit trigger/status (FF72H•D1)
TXTRGS: Serial interface (2) transmit trigger/status (FF5AH•D1)
Functions as the transmit start trigger and the operation status indicator (transmitting/stop status).
When "1" is read: During transmitting
When "0" is read: During stop
When "1" is written: Start transmitting
When "0" is written: Invalid
Starts transmitting when "1" is written to TXTRG/TXTRGS after writing the transmitting data.
TXTRG/TXTRGS can be read as the status. When set to "1", it indicates transmitting operation, and "0"
indicates transmitting stop.
At initial reset, TXTRG/TXTRGS is set to "0".