10 I/O PORTS (P)
10-20
EPSON
S1C17704 TECHNICAL MANUAL
0x5209: P0 Port Key-Entry Reset Configuration Register (P0_KRST)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
P0 Port Key-
Entry Reset
Configuration
Register
(P0_KRST)
0x5209
(8 bits)
D7–2
–
reserved
–
–
–
0 when being read.
D1–0
P0KRST[1:0]
P0 port key-entry reset
configuration
P0KRST[1:0]
Configuration
0x0
R/W
0x3
0x2
0x1
0x0
P0[3:0] = 0
P0[2:0] = 0
P0[1:0] = 0
Disable
D[7:2] Reserved
D[1:0]
P0KRST[1:0]: P0 Port Key-Entry Reset Configuration Bits
Selects a port configuration for the P0 port key-entry reset function.
Table 10.8.3 Configuration of P0 Port Key-Entry Reset
P0KRST[1:0]
Port used for resetting
0x3
P00, P01, P02, P03
0x2
P00, P01, P02
0x1
P00, P01
0x0
Not used
(Default: 0x0)
The P0 key-entry reset is one of the initial reset features and it generates an initial reset signal when the
ports selected here is set to low level at the same time.
For example, if P0KRST[1:0] is set to 0x3, an initial reset will take place when the four ports P00–P03
are set to low level at the same time.
Set P0KRST[1:0] to 0x0 when this function is not used.
Notes
: • When using the P0 port key-entry reset function, make sure that the designated input ports
will not be simultaneously set to low level while the application program is running.
• The P0 port key-entry reset function cannot be used for power-on reset as it must be
enabled with software.
• The P0 port key-entry reset function cannot be used in SLEEP mode.
Содержание S1C17704
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