HD404374FT datasheet(99/161 Pages) RENESAS

99 / 161 page

HD404374/HD404384/HD404389/HD404082/HD404084 Series

Rev.5.00, Sep.11.2003, page 99 of 161

Serial mode register 1 (SMR1: $024)

SMR13 SMR12 SMR11 SMR10

SCK pin

Serial clock

source

Serial clock

(PSS division ratio + 2 or 4)

Serial clock

cycle

Output

Input

Output

Input

PSS

System clock

External clock

PSS

System clock

External clock

PSS

( PER/2048)+2

( PER/512)+2

( PER/128)+2

( PER/32)+2

( PER/8)+2

( PER/2)+2

PER

( PER/2048)+4

( PER/512)+4

( PER/128)+4

( PER/32)+4

( PER/8)+4

( PER/2)+4

PER

4096 tcyc

1024 tcyc

256 tcyc

64 tcyc

16 tcyc

4 tcyc

tcyc

8192 tcyc

2048 tcyc

512 tcyc

128 tcyc

32 tcyc

8 tcyc

tcyc

Bit

Read/Write

Initial value on reset

Bit name

SMR13

SMR12

SMR11

SMR10

Figure 56 Serial Mode Register 1 (SMR1)

Serial mode register 2 (SMR2: $025):

Serial mode register 2 (SMR2) has the following functions. See figure 57.

• R2

2/SI/SO pin PMOS control

• Idle high/low control

Serial mode register 2 (SMR2) is a 2-bit write-only register. The register value cannot be modified in the

transfer state.

Bit 2 (SMR22) of serial mode register 2 (SMR2) controls the on/off status of the R2

2/SI/SO pin PMOS.

The bit 2 (SMR22) only is reset to 0 by an MCU reset.

Bit 1 (SMR21) of serial mode register 2 (SMR2) performs SO pin high/low control in the idle state. The

SO pin changes at the same time as the high/low write.

HD404374FT Datasheet(PDF) 99 Page - Renesas Technology Corp

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