upd75238 Renesas Electronics Corporation., upd75238 Datasheet - Page 146

• Manufacturer Part Number: upd75238
• Description: 4 Bit Single-chip Microcomputer
• Manufacturer: Renesas Electronics Corporation.

146
6.3 OPERATION AFTER A STANDBY MODE IS RELEASED
(1) If a standby mode is released by a RESET input, normal reset operation is performed.
(2) If a standby mode is released by the occurrence of an interrupt request, bit 3 of the IPS (IME) determines
whether to perform a vectored interrupt when the CPU resumes instruction execution.
(a) When IME = 0
(b) When IME = 1
After the standby mode is released, execution of an instruction (NOP instruction) is restarted
immediately after the instruction which set the standby mode.
The interrupt request flag is held.
After the standby mode is released, two instructions are executed, then a vector interrupt is caused.
However, when the standby mode is released by INTW or INT2 (input of a testable signal), no vector
interrupt is caused and the same processing as (a) above is performed.
PD75238