Samsung SAM88RCRI S3C9442 Manual page 106

and POWER-DOWN
RESET
To program the duration of the oscillation stabilization interval, you must make the appropriate settings to
the basic timer control register, BTCON, before entering Stop mode. Also, if you do not want to use the
basic timer watchdog function (which causes a system reset if a basic timer counter overflow occurs),
you can disable it by writing "1010B" to the upper nibble of BTCON.
MCU Initialization Sequence
The following sequence of events occurs during a reset operation:
— All interrupts are disabled.
— The watchdog function (basic timer) is enabled.
— Ports 0–2 are set to input mode
— Peripheral control and data registers are disabled and reset to their initial values (see Table 8-1).
— The program counter is loaded with the ROM reset address, 0100H.
— When the programmed oscillation stabilization time interval has elapsed, the address stored in ROM location
0100H (and 0101H) is fetched and executed.
RESET
Watchdog
RESET
Normal Mode or
Power-Down Mode
8-2
LVR
RESET
RESET
Figure 8-1. Reset Block Diagram
Input
RESET
Figure 8-2. Timing for S3C9442/C9444/C9452/C9454 after
NOTE
Smart option
(3EH.7)
MUX
Oscillation Stabilization wait time (6.55 ms/at 10 MHz)
Idle Mode
Operation
S3C9442/C9444/F9444/C9452/C9454/F9454
Internal
Operation Mode
RESET
RESET