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T80C5112 Datasheet(PDF) 10 Page - ATMEL Corporation

Part # T80C5112
Description  8-bit Microcontroller with A/D converter
Download  97 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T80C5112 Datasheet(HTML) 10 Page - ATMEL Corporation

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10
Rev. B - November 10, 2000
Preliminary
T80C5112
6.4.2.2. IDLE MODES :
· IDLE modes are achieved by using any instruction that writes into PCON.0 sfr
· IDLE modes A and B depend on previous software sequence, prior to writing into PCON.0 register :
·
IDLE MODE A : Xtal_Osc is running (OSCAEN = 1) and selected (CKS = 1)
·
IDLE MODE B : RC_Osc is running (OSCBEN = 1) and selected (CKS = 0)
·
The unused oscillator Xtal_Osc or RC_Osc can be stopped by software by clearing OSCAEN or OSCBEN
respectively.
·
Exit from IDLE mode is acheived by Reset, or by activation of an enabled interrupt.
·
In both case, PCON.0 is cleared by hardware.
·
Exit from IDLE modes will leave the ocillators control bits OSCAEN, OSCBEN and CKS unchanged.
6.4.2.3. POWER DOWN MODES :
· POWER DOWN modes are achieved by using any instruction that writes into PCON.1 sfr
· Exit from POWER DOWN mode is acheived either by an harware Reset, by an external interruption.
·
By RST signal : The CPU will restart in the mode defined by RST_OSC.
·
By INT0 or INT1 interruptions, if enabled. The ocillators control bits OSCAEN, OSCBEN and CKS will
not be changed, so the selected oscillator before entering into Power-down will be activated.
6.4.2.4. Prescaler Divider :
· An hardware RESET selects the prescaler divider :
·
CKRL = FFh: internal clock = OscOut / 2 (Standard C51 feature)
·
X2=0,
·
SEL_OSC signal selects Xtal_Osc or RC_Osc, depending on the value of the RST_OSC configuration bit.
· After Reset, any value between FFh down to 00h can be written by software into CKRL sfr in order to divide
frequency of the selected oscillator:
·
CKRL = 00h : minimum frequency = OscOut / 512
·
CKRL = FFh : maximum frequency = OscOut / 2
PD
IDLE
CKS
OSCBEN OSCAEN
RCLF
_OFF
Selected Mode
Comment
0
0
1
X
1
X
NORMAL MODE A
OSCA: XTAL clock
X
X
1
X
0
1
INVALID
no active clock
0
0
1
0
0
0
RESCUE MODE
OSCC: Low speed RC clock active
0
0
0
1
X
X
NORMAL MODE B,
OSCB: high speed RC clock
X
X
0
0
X
1
INVALID
0
0
0
0
0
0
RESCUE MODE
OSCC: Low speed RC clock active
0
1
1
X
1
X
IDLE MODE A
The CPU is off, OSCA supplies the
peripherics
0
1
0
1
X
X
IDLE MODE B
The CPU is off, OSCB supplies the
peripherics
1X
X
X
1
0
POWER DOWN MODE
with WD
The CPU and peripherics are off, but
OSCC is still running for WD
1
X
X
X
X
1
TOTAL POWER DOWN
The CPU is off, OSCA and OSCB are
stopped
OSCC is stopped


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