em78p468l ELAN Microelectronics Corp, em78p468l Datasheet - Page 19

• Manufacturer Part Number: em78p468l
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.5) 02.15.2007
(This specification is subject to change without further notice)
it must delay a little times for the main
oscillation stable w hile your system timing
control is conscientious
Fm:stop
Fs: stop
CPU: stop
SLEEP Mode
The w ake up time from sleep to green mode is
approximately sub-oscillator setup time +18ms+16*1/fs
6.1.15 RE/IRCR (IR and Port 5 Setting Control Register)
CPU Operation Mode
Bit 7 (IRE): Infrared Remote Enable bit
Bit 6 (HF): High carry frequency
Bit 5 (LGP): IROUT for of low pulse width timer
Bit 7
IRE
(Address: 0Eh)
IRE = “1” : Enable IR or PWM function.
HF = “0” : For PWM application, disable the H/W modulator function. The IROUT
LGP = “1” : The high-pulse width timer register is ignored. So the IROUT
IRE = “0” : Disable the IR/PWM function. The state of P5.7/IROUT pin is
HF = “1” : For IR application mode, enable the H/W modulator function, the low
LGP = “0” : The high-pulse width timer register and low-pulse width timer is valid.
Wake up
Bit 6
HF
IDLE="0"
SLEP
waveform is generated according to high-pulse and low-pulse time as
determined by the respective high pulse and low pulse width timers.
Counter 2 is an independent auto reload timer.
time sections of the generated pulse is modulated with the Fcarrier
frequency. The Fcarrier frequency is provided by Counter 2.
determined by Bit 7 of IOC 50 if it is for IROUT.
waveform is dependent on the low-pulse width timer register only.
CPUS="1"
Fig. 6-3 CPU Operation Mode
Bit 5
LGP
fm:stop
fs: oscillation
CPU: using fs
fm:oscillation
fs: oscillation
CPU: using fosc
Normal Mode
Green Mode
Bit 4
−
CPUS="0"
IROUTE
Bit 3
Code option
HLFS=1
IDLE="1"
SLEP
w ake up
The w ake up time from idle to green
mode is 16*1/fs
EM78P468N/EM78P468L
TCCE
Bit 2
8-Bit Microcontroller
RESET
EINT1
Code option
HLFS=0
fm:stop
fs: oscillation
CPU: stop
Bit 1
IDLE Mode
EINT0
Bit 0
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