EM6603 EM Microelectronic, EM6603 Datasheet - Page 7

• Manufacturer Part Number: EM6603
• Description: Ultra Low Power Multi I/O Microcontroller
• Manufacturer: EM Microelectronic

3.3 Input port (PA0..PA3) RESET
With a mask option it is possible to choose from four PortA reset combinations. The selected ports must be
simultaneously high for at least 2ms/16ms (CLK = 32kHz) due to the presence of debouncers. Note also, that
RESET with port A is not possible during SLEEP mode.
Below are the combinations of Port A (PA0..PA3) inputs, which can be used to generate a RESET. They can be
selected by metal « PortA RESET » mask option, described in chapter 14.
Table 3. PortA Inputs RESET options (metal Hardware option)
3.4
The Watchdog Timer RESET is a software option and if used it will generate a RESET if it is not cleared. See
section 5. Watchdog timer for details.
Table 4. Watchdog-Timer Option (software option)
3.5 CPU State after RESET
RESET initialises the CPU as shown in the Table 5 below.
Table 5. Initial Value After RESET
name
Program counter 0
Program counter 1
Program counter 2
stack pointer
index register
Carry flag
Zero flag
HALT
Instruction register
periphery registers
Copyright  2002, EM Microelectronic-Marin SA
Watchdog Function
Without Watchdog Time-out reset
With Watchdog Time-out reset
Option A
Option B
Option C
Option D
Watchdog Timer RESET
Function
no inputs RESET
RESET = PA0 * PA1
RESET = PA0 * PA1 * PA2
RESET = PA0 * PA1 * PA2 * PA3
bits
12
12
12
2
7
1
1
1
16
4
symbol
PC0
PC1
PC2
SP
IX
CY
Z
HALT
IR
NoWD bit in Option register
initial value
$000 (as a result of Jump 0)
undefined
undefined
SP(0) selected
undefined
undefined
undefined
0
Jump 0
see peripheral memory map
Opt. Code
RA0
RA1
RA2
RA3
1
0
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EM6603
03/02 REV. G/439