SN8P2604
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 99
Version 1.1
11.5.3 SYSTEM CLOCK
SONIX 2 series 8-bit MCU has multi-system clock (Fosc/1~Fosc/8,Fosc/64,Fosc/8,), but ICE is fixed Fosc/4. In ICE
emulation, user must be sure the Fcpu speeds of SN8P2604 and ICE are identical. Before emulation, change ICE
crystal frequency to match with SN8P2604 system clock.
Example: SN8P2604 system clock vs. ICE Table. The SN8P2604 clock source frequency is external 4MHz
crystal.
SN8P2604 Fcpu Option
Fcpu Frequency
ICE Fcpu
ICE Crystal Frequency
Fosc/1 4MHz
Fosc/4
16MHz
Fosc/2 2MHz
Fosc/4
8MHz
Fosc/4 1MHz
Fosc/4
4MHz
Fosc/8 0.5MHz
Fosc/4
2MHz
Note: For different speed crystals, modifying ICE “HIGH CLK” option is necessary. If ICE crystal is
16MHz, set “HIGH CLK” options to “X’TAL 12M”.
Example: SN8P2604 system clock vs. ICE Table. The SN8P2604 clock source frequency is external 16MHz
crystal.
SN8P2604 Fcpu Option
Fcpu Frequency
ICE Fcpu
ICE Crystal Frequency
Fosc/1 16MHz
Fosc/4 -
Fosc/2 8MHz
Fosc/4 -
Fosc/4 4MHz
Fosc/4
16MHz
Fosc/8 2MHz
Fosc/4
8MHz
Note: ICE external high clock crystal is up to 16MHz. Fcpu = Fosc/1 and Fosc/2 can’t be emulated. For
the applications, users should use SN8P2604 to verify functions.