EM78P458/459
OTP ROM
Address
0xA
Name
Reset Type
Wake-up from Pin Changed
Bit Name
Bit 7
P
-
0
0
P
Bit7
0
Bit 6
P
Bit 5
P
Bit 4
P
Bit 3
P
Bit 2
P
Bit 1
P
Bit 0
P
-
-
-
-
-
-
-
Power-on
0
0
P
Bit6
0
0
P
X
0
0
0
Bit6
0
0
P
X
0
0
P
Bit5
0
0
P
X
0
0
0
Bit5
0
0
P
X
0
0
P
Bit4
0
0
P
X
0
0
0
Bit4
0
0
P
X
0
0
P
Bit3
0
0
P
X
0
0
0
Bit3
0
0
P
X
0
0
P
Bit2
0
0
P
X
0
0
0
Bit2
0
0
P
X
0
0
P
Bit1
0
0
P
Bit1
0
0
P
Bit1
0
0
P
Bit1
0
0
P
ICIF
0
0
0
P
Bit0
0
0
P
Bit0
0
0
P
Bit0
0
0
P
Bit0
0
0
P
TCIF
0
RA
(ADDDATA)
/RESET and WDT
Wake-up from Pin Changed
Bit Name
Power-on
RB
0xB
0xC
(TMR1L)
/RESET and WDT
Wake-up from Pin Changed
Bit Name
0
P
X
0
0
0
Bit7
0
0
P
X
0
0
0
X
0
0
Power-on
RC
(TMR1H)
/RESET and WDT
Wake-up from Pin Changed
Bit Name
Power-on
RD
0xD
(TMR2L)
/RESET and WDT
Wake-up from Pin Changed
Bit Name
Power-on
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
EXIF
0
0
RE
0xE
(TMR2H)
/RESET and WDT
Wake-up from Pin Changed
Bit Name
CMPIF PWM2IF PWM1IF
ADIF
0
0
P
-
Power-on
0
0
P
-
0
0
P
-
0
0
P
-
RF
0xF
(ISR)
/RESET and WDT
Wake-up from Pin Changed
Bit Name
0
P
-
0
P
-
0
-
P
-
Power-on
/RESET and WDT
Wake-up from Pin Changed
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
0x10~0x3F
R10~R3F
X: not used. U: unknown or don’t care.
t: check Table 5
P: previous value before reset.
4.12 Oscillator
1. Oscillator Modes
The EM78P458 and EM78P459 can be operated in four different oscillator modes, such as High
XTAL oscillator mode (HXT), Low XTAL oscillator mode (LXT), External RC oscillator mode (ERC),
and RC oscillator mode with Internal capacitor (IC). Users can select one of them by programming the
MASK Option. The up-limited operation frequency of crystal/resonator on the different VDDs is listed
in Table 11.
Table 12 The Summary of Maximum Operating Speeds
Conditions
VDD
2.3
Fxt max.(MHz)
4
8
20
Two clocks
3.0
5.0
2. Crystal Oscillator/Ceramic Resonators (XTAL)
EM78P458/459 can be driven by an external clock signal through the OSCI pin as shown in Fig. 18
This specification is subject to change without prior notice.
45
06.25.2004 (V1.4)
ELAN [ ELAN MICROELECTRONICS CORP ]
