MITSUBISHI MICROCOMPUTERS
7477/7478 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
STP instruction preparation (pushing registers)
↓
Timer 3, timer 4 interrupt disable
↓
X/16 or XC/16 selected for timer 3 count source; timer 3 overflow selected for timer 4 count source
↓
Timer 3, timer 4 start counting
↓
Values set to timer 3, timer 4 that do not cause timer 4 to overflow until STP instruction is executed
↓
Interrupt for return from STP enabled
↓
Timer 4 interrupt request bit cleared
↓
Clock X and clock for clock function XC halt (STP instruction)
RAM backup status
Interrupts from INT0, INT1, CNTR0/CNTR1, timer 1, timer 2, serial I/O, key on wake up
↓
Clock X and clock for clock function XC oscillation start
↓
Timer 4 overflow (X/16 or XC/16→timer 3→timer 4)
↓
Internal system clock start
↓
Program start from interrupt vector
Normal program
34
MITSUBISHI [ Mitsubishi Group ]
