NEC PD78F9488 Manuale Utente
CHAPTER 19 FLASH MEMORY VERSION
330
User’s Manual U15331EJ4V1UD
19.2 Cautions on
µ
PD78F9488 and 78F9489
(1) When using HALT mode with subclock multiplied by four
Observe the following constraints when using the flash version (
µ
PD78F9488 and 78F9489) in the HALT
mode with the subclock multiplied by 4 as the CPU clock.
• Be sure to insert the following number of NOP instructions immediately after the HALT instruction.
Operating Temperature
Number of NOP Instructions
T
A
=
−40 to +45°C 2
T
A
=
−40 to +80°C 3
T
A
=
−40 to +85°C 4
• Save the value of the A register to the internal high-speed RAM area before the HALT instruction is
executed (because the value of the A register may be changed when the HALT mode is released).