Abov MC96F6332D, User Manual

Page: 112 / 327

MC96F6432
112 June 22, 2018 Ver. 2.9
OSCCR (Oscillator Control Register) : C8H
7 6 5 4 3 2 1 0
– –
IRCS2 IRCS1 IRCS0 IRCE XCLKE SCLKE
– –
R/W R/W R/W R/W R/W R/W
Initial value : 08H
IRCS[2:0] Internal RC Oscillator Post-divider Selection
IRCS2 IRCS1 IRCS0 Description
0 0 0 INT-RC/32 (0.5MHz)
0 0 1 INT-RC/16 (1MHz)
0 1 0 INT-RC/8 (2MHz)
0 1 1 INT-RC/4 (4MHz)
1 0 0 INT-RC/2 (8MHz)
1 0 1 INT-RC/1 (16MHz)
Other values Not used
IRCE Control the Operation of the Internal RC Oscillator
0 Enable operation of INT-RC OSC
1 Disable operation of INT-RC OSC
XCLKE Control the Operation of the External Main Oscillator
0 Disable operation of X-TAL
1 Enable operation of X-TAL
SCLKE Control the Operation of the External Sub Oscillator
0 Disable operation of SX-TAL
1 Enable operation of SX-TAL
NOTES) When IRC is system clock and clock frequency is changed, NOP must follow immediately after the clock
frequency change instruction.
Example)
MOV OSCCR, #0x21 ; Change the frequency to 16MHz in IRC
NOP ; Add dummy instruction, this instruction must be needed.