EM78P468NBQ EMC [ELAN Microelectronics Corp], EM78P468NBQ Datasheet - Page 20

• Manufacturer Part Number: EM78P468NBQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P468N
8-BIT Microcontroller
16 •
4.1.14
Bit 7: Not used
Bit 6 ~ 4 (CLK2 ~ CLK0): main clock selection bits for PLL mode (code option select)
Bit 3 (IDLE) : idle mode enable bit. This bit will decide the intended mode of the SLEP
instruction.
IDLE=”0”+SLEP instr
IDLE=”1”+SLEP instruction => idle mode
* NOP
Ex
Bit 2,1 (BF1,
Bit 0
sub-o
CLK2
ample
Bit 7
0
0
0
0
1
--
CPUS = “0”: sub-oscillator (Fs)
CPUS = “1”: main oscillator (Fm)
CNT1EN = “1” : Enable Counter 1. Count operation start.
scillator and the main oscillator is stopped.
BF1
(CPUS): CPU oscillator source select, When CPUS=0, the CPU oscillator select
(Address: 0Dh)
RD/SBPCR (System, Booster and PLL Control Register)
instruction must b
0
0
1
1
: IDL
SLEEP mode : IDLE bit = “0
CLK1
CLK2
0): LCD booster frequency select bit to adjust VLCD 2,3 driving.
Bit 6
X
0
0
1
1
E m
ode
uction => sleep mode
CLK0
: IDLE
CLK1
Bit 5
BF0
X
0
1
0
1
e added after SLEP instruction.
0
1
0
1
bit =
CLK0
Bit 4
“1”
(This specification is subject to change without further notice)
Main clock
Booster frequency
” +SLEP instruction + NOP instruction
+SLEP instruc
Fs*65/2
Fs*65/4
Fs*130
Fs*244
Fs*65
IDLE
Bit 3
Fs/16
Fs/4
Fs/8
Product Specification (V1.2) 03.15.2005
Fs
tion + NOP instru ion
Bit 2
BF1
Example Fs=32.768K
1.065 MHz
4.26 MHz
2.13 MHz
532 KHz
Bit 1
BF0
8 MHz
ct
CPUS
Bit 0