HD6433713 datasheet(188/324 Pages) RENESAS

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10.2 Register Descriptions

10.2.1 Serial Mode Register 1 (SMR1)

SMR1 is an 8-bit write-only register, for selecting the operation mode and the prescaler divider

ratio. Another function is to initialize the internal state of the serial interface, which happens at

each write access to SMR1.

When SMR1 is written to, serial clock supply to serial data registers U1 and L1 (SDRU1, SDRL1)

and to the octal/hexadecimal counter is stopped, and the octal/hexadecimal counter is reset to

H'00. Accordingly, writing to the serial mode register while the serial interface is operating will

abort data transmission or reception, and the serial communication interface 1 interrupt request

flag (IRRS1) will be set.

Upon reset, SMR1 is initialized to H'80.

Bit 7: Reserved bit

Bit 7 is reserved; it always reads 1, and cannot be modified.

Bits 6 to 4: Operation mode select (SMR16 to SMR14)

Bits 6 to 4 select the SCI1 operation mode.

Bit 6

Bit 5

Bit 4

SMR16

SMR15

SMR14

Description

Continuous clock output mode

(initial value)

SMR15, SMR14 set to value other

8-bit transfer mode

than 00

Continuous clock output mode

SMR15, SMR14 set to value other

16-bit transfer mode

than 00

Bit

Initial value

Read/Write

—

SMR16

SMR15

SMR14

SMR13

SMR10

SMR12

SMR11

177

HD6433713 Datasheet(PDF) 188 Page - Renesas Technology Corp

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