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T84C5112-S3REV Datasheet(PDF) 9 Page - ATMEL Corporation

Part # T84C5112-S3REV
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

T84C5112-S3REV Datasheet(HTML) 9 Page - ATMEL Corporation

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Rev. B - November 10, 2000
9
Preliminary
T80C5112
6.3. Functional Block diagram
Figure 1. Functional block diagram
6.4. Operating modes
6.4.1. Reset :
· An hardware RESET select Xtal_Osc or RC_Osc depending on the RST_OSC configuration bit
6.4.2. Functional modes :
6.4.2.1. NORMAL MODES :
· CPU and Peripherals clock depend on the software selection using CKCON0, CKCON1, CKSEL and CKRL
registers
·
CKS bit selects either Xtal_Osc or RC_Osc
·
CKRL register determines the frequency of the selected clock, unless X2 bit is set.
In this case the prescaler/divider is not used, so CPU core needs only 6-clock period per machine cycle.
According to the value of the peripheral X2 individual bit, each peripherals need 6 or 12 clock period per
instructions.
·
It is always possible to switch dynamicaly by software from Xtal_Osc to RC_Osc, and vice versa by changing
CKS bit, a synchronization cell allowing to avoid any spike during transition.
Xtal2
Xtal1
PwdRC
WD clock
PwdOsc
Ckrl
Reload
8-bit
Prescaler-Divider
ResetB
1
0
OscOut
Xtal_Osc
RC_Osc
XT_SP
OSCBEN
OSCAEN
CKS
X2
0
1
1
0
RCLF_Osc
RCLF_OFF
Mux
Filter
+
RCLF_OFF
OSCA
OSCB
OSCC
CkIdle
Ck
Idle
Cpu clock
Peripherals clock
Pwd
CkOut
CkAdc
Quiet
OSCBEN
OSCAEN
0
1
:128
A/D clock
Sub Clock
Timer 0 clock


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