Epson S1C33210 Technical Manual page 232

II CORE BLOCK: CLG (Clock Generator)
The following shows the operating status in HALT mode (basic mode and HALT2 mode) and SLEEP mode.
Standby mode
HALT mode Basic mode
HALT2 mode
SLEEP mode
CLGP7–CLGP0:Power-control register protection flag
These bits remove the protection against writing to addresses 0x40180 and 0x40190.
Write "0b10010110": Write protection removed
Write other than the above: No operation (write-protected)
Read: Valid
Before writing to address 0x40180 or 0x40190, set CLGP[7:0] to "0b10010110" to remove the protection against
writing to that address. This clearing of write protection is effective for only one writing, so the bits are cleared to
"0b00000000" by one writing. Therefore, CLGP[7:0] must be set each time the protected address is written to.
At initial reset, CLGP is set to "0b00000000" (write-protected).
B-II-6-8
Table 6.6 Operating Status in Standby Mode
Operating status
• The CPU clock is stopped. (CPU stop status)
• BCU clock is supplied. (BCU run status)
• DMA clock is not stopped. (DMA run status)
• Clocks for the peripheral circuits maintain the
status before entering HALT mode. (run or
stop)
• The high-speed oscillation circuit maintains
the status before entering HALT mode.
• The low-speed oscillation circuit maintains the
status before entering HALT mode.
• The CPU clock is stopped. (CPU stop status)
• BCU clock is stopped. (BCU stop status)
• DMA clock is stopped. (DMA stop status)
• Clocks for the peripheral circuits maintain the
status before entering HALT mode. (run or
stop)
• The high-speed oscillation circuit maintains
the status before entering HALT mode.
• The low-speed oscillation circuit maintains the
status before entering HALT mode.
• The CPU clock is stopped. (CPU stop status)
• BCU clock is stopped. (BCU stop status)
• Clocks for the peripheral circuits are stopped.
• The high-speed oscillation circuit is stopped.
• The low-speed oscillation circuit maintains the
status before entering SLEEP mode.
EPSON
• Reset, NMI
• Enabled (not masked) interrupt
factors
In HALT2 mode, operation can be
restarted by the following events.
• Reset, NMI
• The occurrence of an unmasked
interrupt
However, interrupts from peripheral
circuits require that the clock
supplied to the peripheral circuit in
question be operating.
• Reset, NMI
• Enabled (not masked) input port
interrupt factors
• Clock timer interrupt when the
low-speed oscillation circuit is
being operated
([D[7:0]) / Power control protection register (0x4019E)
Reactivating factor
S1C33210 FUNCTION PART