EM78P417N/418N/419N
8-Bit Microprocessor with OTP ROM
ꢀ The IOCB0 register bits are set to all "1"
ꢀ The IOCC0 register bits are set to all "1"
ꢀ The IOCD0 register bits are set to all "1"
ꢀ Bit 7 of the IOCE0 register is set to "1", and Bit 6~0 are cleared
ꢀ Bits 0~6 of RF register and bits 0~6 of IOCF0 register are cleared
Executing the “SLEP” instruction will assert the sleep (power down) mode. While
entering sleep mode, the Oscillator, TCC, TIMER1, TIMER2, and TIMER3 are stopped.
The WDT (if enabled) is cleared but keeps on running.
The controller can be awakened by-
Case 1 External reset input on /RESET pin
Case 2 WDT time-out (if enabled)
Case 3 Port 6 input status changes (if ICWE is enabled)
Case 4 Comparator output status changes (if CMPWE is enabled)
Case 5 AD conversion completed (if ADWE enable).
The first two cases (1 & 2) will cause the EM78P417/8/9N to reset. The T and P flags of
R3 can be used to determine the source of the reset (wake-up). Cases 3, 4, & 5 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 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 is150µs, no matter what the oscillator type or mode is (except when it’s in
low XTAL mode). Under low XATL mode, wake up time is 500ms.
Only one of the Cases 1 to 5 can be enabled before entering into sleep mode. That is:
Case [a] If WDT is enabled before SLEP, all of the RE bit is disabled. Hence, the
EM78P417/8/9N can be awaken only with Case 1 or Case 2. Refer to the
section on Interrupt (Section 6.6) for further details.
Case [b] If Port 6 Input Status Change is used to wake -up EM78P417/8/9N and ICWE
bit of RE register is enabled before SLEP, WDT must be disabled. Hence,
the EM78P417/8/9N can be awaken only with Case 3. Wake-up time is
dependent on oscillator mode. Under RC mode the reset time is 32 clocks
(for oscillator stables).
In High XTAL mode, reset time is 2ms and 32clocks(for oscillator stables);
and in low XTAL mode, the reset time is 500ms.
Product Specification (V1.0) 06.23.2005
• 31
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
