1997 Apr 10
17
Philips Semiconductors
Product specification
Low voltage 8-bit microcontrollers with
I
2
C-bus
P80CL410; P83CL410
12.3
Wake-up from Power-down mode
When in Power-down mode the controller can be
woken-up with either the external interrupts INT2 to INT9,
or a reset operation. The wake-up operation has two basic
approaches as explained in Section 12.3.1; 12.3.2 and
illustrated in Fig.10.
12.3.1
W
AKE
-
UP USING
INT2
TO
INT9
If any of the interrupts INT2 to INT9 are enabled, the
device can be woken-up from the Power-down mode with
the external interrupts. To ensure that the oscillator is
stable before the controller restarts, the internal clock will
remain inactive for 1536 oscillator periods. This is
controlled by an on-chip delay counter.
12.3.2
W
AKE
-
UP USING
RST
To wake-up the P8xCL410, the RST pin must be kept
HIGH for a minimum of 24 periods. The on-chip delay
counter is inactive. The user must ensure that the oscillator
is stable before any operation is attempted.
12.4
Power Control Register (PCON)
See Tables 2 and 3. Idle and Power-down modes are
activated by software using this SFR. PCON is not
bit-addressable.
12.5
Status of external pins
The status of the external pins during Idle and Power-down
mode is shown in Table 3. If the Power-down mode is
activated whilst accessing external Program Memory, the
port data that is held in the Special Function Register P2 is
restored to Port 2.
If the data is a logic 1, the port pin is held HIGH during the
Power-down mode by the strong pull-up transistor ‘p1’;
see Fig.8(a).
Table 2
Power Control Register (address 87H)
Table 3
Description of PCON bits
Table 4
Status of external pins during Idle and Power-down modes
7
6
5
4
3
2
1
0
GF1
GF0
PD
IDL
BIT
SYMBOL
GF1 and GF0
General purpose flag bits
PD
Power-down bit;
setting this bit activates the Power-down mode
IDL
Idle mode bit;
setting this bit activates the Idle mode
DESCRIPTION
7, 6, 5, 4
3 and 2
1
0
reserved
MODE
MEMORY
ALE
PSEN
PORT 0
PORT 1
PORT 2
PORT 3
PORT 4
Idle
internal
external
internal
external
1
1
0
0
1
1
0
0
port data
floating
port data
floating
port data
port data
port data
port data
port data
address
port data
port data
port data
port data
port data
port data
port data
port data
port data
port data
Power-down