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Note that each unit inside Saturn is initialized to the state shown in Table 1.1 when the power is turned on.

Table 1.1 Initial state at power ON 
 status 
 contents 
 Sound CPU is off 
 The sound CPU is reset. The 
 SNDON command starts the power-on vector 
. 
 VDP1, VDP2, SCU, SCSP ON state 
 Accessible from SH-2 
 
 Slave SH OFF state 
 Slave SH-2 is reset 
. It starts moving from the power-on vector by the SSHON command. 
 DOT SEL OFF state 
 PLL oscillation frequency is 320 mode 
 (NTSC: 26.8741MHz, PAL: 26.6875MHz) 
 and VDP1, VDP2 , SH-2 is operating at this frequency. Operates in 352 mode 
 (NTSC: 28.6364MHz, PAL: 28.4375MHz) 
 with CKCHG352 command. 
 CD block ON status 
 Accessible from SH-2 
.

■ Function

SMPC has three functions: RTC (Real Time Clock), SM (System Management), and PC (Peripheral Control).
Table 1.2 shows the main functions of SMPC.

Table 1.2 SMPC functions 
 RTC 
 (Real Time Clock) 
 ・ Time setting and acquisition from SH-2 
 ・ Year Automatic update of month, day, hour, minute, second 
 (Battery backup is possible when main power is off) 
 SM 
 (System Management) 
-Sound CPU ON / OFF 
-Master SH-2, Slave SH-2 ON / OFF 
 ・ System reset control 
 ・ Clock switching (PLL control) 
 ・ Power ON reset 
 ・ NMI to master S-2 by pressing front panel button Request 
 PC 
 (Peripheral Control) 
-Supports peripherals with the Saturn peripheral interface specification 
 > Automatic collection of peripheral data 
 for control pads, mice, etc. 
-Supports mega drive peripherals (3 buttons, 6 buttons, 
 SEGATAP) (However, a conversion adapter is required.) )

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