em78p210n ELAN Microelectronics Corp, em78p210n Datasheet - Page 32

• Manufacturer Part Number: em78p210n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

EM78P210N
8-Bit Microcontroller with OTP ROM
26 •
The first two cases (1 and 2) will cause the EM78P210N to reset. The T and P flags of
R3 can be used to determine the source of the reset (wake-up). Cases 3 & 4 are
considered the continuation of program execution and the global interrupt ("ENI" or
"DISI" being executed) decides whether or not the controller branches to the interrupt
vector following a wake-up. If ENI is executed before SLEP, the instruction will begin to
execute from Address 0x8 after wake-up. If DISI is executed before SLEP, the
execution will restart from the instruction next to SLEP after wake-up. All sleep mode
wake up time is dependent on the oscillator mode, no matter what the oscillator type or
mode is (except when it’s in LXT2 mode). In LXT2 mode, wake-up time is 2~3 sec.
Although each of Cases 1 to 4 can be enabled, but not simultaneously, only one at a
time can be enabled before entering sleep mode. That is:
Case [a] If WDT is enabled before SLEP, all of the RE bit is disabled. Hence, the
Case [b] If Port 6 Input Status Change is used to wake -up EM78P210N and ICWE bit
Case [c] If the Comparator output status change is used to wake-up the EM78P210N
EM78P210N can be awakened only with Case 1 or Case 2. Refer to the
section on Interrupt (Section 6.6) for further details.
of Bank 0-RE register is enabled before SLEP, WDT must be disabled.
Hence, the EM78P210N can be awakened only with Case 3. Wake-up time
is dependent on the oscillator mode. In RC mode (VDD: 5V, IRC: 4 MHz),
wake-up time is 10 μs (for stable oscillators). In HXT2 mode (VDD: 5V,
Crystal: 4 MHz, C1/C2: 30pF), wake-up time is 800 μs (for stable oscillators),
and in LXT2 mode, wake-up time is 2~3 sec.
and the CMPWE bit of the RE register is enabled before SLEP, WDT must be
disabled by software. Hence, the EM78P210N can be awakened only with
Case 4.
Wake-up time is dependent on the oscillator mode. In RC mode (VDD: 5V,
IRC: 4MHz), wake-up time is 10μs (for stable oscillators). In HXT2 mode
(VDD: 5V, Crystal: 4 MHz, C1/C2: 30pF), wake-up time is 800 μs (for stable
oscillators), and in LXT2 mode, wake-up time is 2~3 sec.
(This specification is subject to change without further notice)
Product Specification (V1.2) 04.22.2008