EM78P350N
8-Bit Microprocessor with OTP ROM
Bit 9 (LCE):
Low crystal output enable
1 : Select General-purpose I/O (P74, P73)
0 : Low crystal 32.768kHz mode. P74, P73 can be connected to a
low crystal.
Bit 8 (CLKS):
Instruction time period option bit
0 = two oscillator time periods
1 = four oscillator time periods (default)
Refer to the Section 6.15 for Instruction Set
Bit 7 (ENWDTB): Watchdog timer enable bit
0 = Enable
1 = Disable (default)
Bits 6, 5 & 4 (OSC2, OSC1 & OSC0): Oscillator Modes Selection bits
Oscillator Modes
OSC2
OSC1
OSC0
ERC1 (External RC oscillator mode); P50/OSCO functions as P50
ERC1 (External RC oscillator mode); P50/OSCO functions as OSCO
IRC2 (Internal RC oscillator mode); P50/OSCO functions as P50
IRC2 (Internal RC oscillator mode); P50/OSCO functions as OSCO
LXT3 (Low Crystal oscillator mode)
0
0
0
0
1
1
0
0
1
1
1
1
0
1
0
1
0
1
HXT3 (High Crystal oscillator mode) (default)
1 In ERC mode, OSCI is used as oscillator pin. OSCO/P50 is defined by code option Word 0 Bit 6 ~ Bit 4.
2 In IRC mode, P51 is normal I/O pin. OSCO/P50 is defined by code option Word 0 Bit 6 ~ Bit 4.
3 In LXT and HXT modes; OSCI and OSCO are used as oscillator pins. These pins cannot and should not be
defined as normal I/O pins.
NOTE
The transient point of the system frequency between HXT and LXY is 400kHz.
Bit 3 (HLP): Power consumption selection
0 = Low power consumption, applies to working frequency at 4MHz or
below 4MHz
1 = High power consumption, applies to working frequency above 4MHz
Bits 2 ~ 0 (PR2 ~ PR0): Protect Bit
PR2 ~ PR0 are protection bits. Each protect status is as follows:
PR2
0
PR1
0
PR0
0
Protect
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Disable
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
86 •
Product Specification (V1.0) 09.14.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
