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1745D–ATARM–04-Nov-05
AT91M55800A
Figure 12-2. APMC Block Diagram
ARM7TDMI
Clock
NIRQ
NFIQ
IDLE MODE
FF
APMC_SCDR
APMC_SCSR
MCK (Master Clock)
Prescaler
Peripheral Clocks
Clear
Set
XIN
XOUT
MCKO
MCKODS
PRES
APMC_PCER
APMC_PCDR
APMC_PCSR
MOSCBYP
MUL
MOSCEN
CSS
PLL
Main
Oscillator
Reset
Control
RTC
Oscillator
RTC
(1)
Backup Reset
Slow Clock
RTC Alarm
Shut-down
Alarm
Backup
Reset
Wake-up
Acknowledge
Alarm
Shut-down
Alarm
Output
Controller
SHDN
WKACKS
SHDALS
WKEDG
WAKEUP
Edge Detector
WKACKC
ALWKEN
ALSHEN
SHDALC
NRSTBU
XIN32
XOUT32
Battery Power
VDDBU
Main Power
VDDIO
VDDCORE
Note: 1. The RTC is described in another chapter