10 INPUT/OUTPUT PORT (P)
S1C17001 TECHNICAL MANUAL
EPSON
101
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
Select the port combination used for P0 port key entry resetting.
Table 10.8.3: P0 port key entry input reset settings
P0KRST[1:0]
Ports used
0x3
P00, P01, P02, P03
0x2
P00, P01, P02
0x1
P00, P01
0x0
Not used
(Default: 0x0)
The key entry reset function performs an initial reset by inputting Low level simultaneously from exter-
nally to the port selected here.
For example, if P0KRST[1:0] is set to 0x3, an initial reset is performed when the four ports P00 to P03
are simultaneously set to Low level.
Set P0KRST[1:0] to 0x0 when this reset function is not used.
Note: • Make sure the specified ports are not simultaneously switched to Low during normal
operations when using the P0 port key-entry reset function.
• The P0 port key entry reset function is disabled on initial resetting and cannot be used
for resetting at power-on.
• The P0 port key-entry reset function cannot be used in SLEEP state.
Summary of Contents for S1C17001
Page 1: ...Technical Manual S1C17001 CMOS 16 BIT SINGLE CHIP MICROCONTROLLER ...
Page 33: ...4 POWER SUPPLY VOLTAGE 24 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
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Page 133: ...11 16 BIT TIMER T16 124 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
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