gc80c521a CORERIVER Semiconductor, gc80c521a Datasheet - Page 82

• Manufacturer Part Number: gc80c521a
• Description: Flash / Isp / Iap 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

PCON (87h) : Extended Interrupt Enable Register
EXIF (91h) : External Interrupt Flag Bit Register
6.17. Clock Circuit : SFR
SMOD1 SMOD0
R/W(0) R/W(0)
R/W(0) R/W(0) R/W(0) R/W(0) R/W(1)
System Clock Sources
Disable of External Clock (Crystal or External
Oscillator)
Disable of the Internal RING Oscillator
Wake-up from stop by WDT
IE5
PD
IDL
XT/RG
Crystal OSC
Oscillator
Internal RING OSC
If XTOFF is set.
When MCU is in stop mode and WDT is not active.
If RINGON is cleared.
When MCU is in stop mode and WDT is not active.
WDT is active in stop mode if EWT is set or WDT interrupt
is enabled.
In this case, the clock of WDT is alive during stop mode.
IE4
: Power-down (Stop) mode enable.
: IDL mode enable
: System clock selection.
0 = Internal RING Oscillator is selected as system clock.
1 = External clock is selected as system clock.
IE3
-
R/W(1) R/W(0) R/W(0) R/W(0) R/W(0)
POF
IE2
XT/RG
GF1
RGMD
R(0)
GF0
R/W(0) R/W(1)
RGSL
PD
BGS
IDL
PMR (C4h) : Power Management Control Register
STATUS (C5h) : Crystal Status Register
OSCICN (C6h) : Internal RING Oscillator Control Register
OSCICN2 (C7h) : Test Internal RING Oscillator Control Register
-
-
-
-
XTOFF
XTUP
RINGON : 1 = Internal ring Oscillator is running.
RINGON2 : 1 = Test Internal ring Oscillator is running.
-
-
-
-
: 1 = External crystal Oscillator disable (Default).
: Crystal Oscillator warm-up status.
It represents if the crystal clock is stable(1) or not(0).
0 = External crystal will restart.
Cleared by H/W if XTOFF is set or if PD is set and
WDT is not enabled.
Set by H/W after crystal stabilization time.
0 = Internal ring Oscillator is killed.
Don’t clear RINGON bit when XTRG = 0.
0 = Test Internal ring Oscillator is killed.
Must clear the flag for saving power at STOP mode
-
-
-
-
MiDAS1.0B Family
XTUP
R(0)
-
-
-
-
R/W(1) R/W(0)
R/W(1) R/W(1) R/W(0) R/W(0)
XTOFF
DIV2
-
-
RINGON2
R/W(1)
RINGON
ALEOFF
-
DIV1
-
-
DIV0
-
-
-
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