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GFK-0467K Chapter 2 System Operation 2-31
2
*
ALL
CLEAR
CLEAR PRG, CFG,
AND REGS
CLEAR ALL
19
STOP MODE
Clear All Process
LOW BATT
TRUE
CORRUPT
URAM
11
FALSE
PRESENT AND
USD
VALID
2
START
a45680
Go to Clear All Process
*
TRUE
FALSE
CLR M T
HHP
KEYS
*
ALL
CLEAR
1
FALSE
PRG SRC =
URAM
PROM
4
FALSE
PRG SRC =
USD
PROM
3
TRUETRUE
REG SRC =
USD
PROM
5
TRUE
FALSE
TRUE
LD NOT
HHP
KEYS
6
STOP MODE
TRUE
LD NOT
HHP
KEYS
7
COPY
PRG & CFG FROM
COPY PRG ,CFG,
& REGS FROM
USD TO URAM
USD TO URAM
FALSEPRG or CFG
CHECKSUM
10
BAD
TRUE
TRUE
PRG SRC =
URAM
PROM
12
TRUE
PU MODE =
URAM
RUN
15
FALSE
NOT RUN
HHP
KEYS
14
16
FALSE
PU MODE =
URAM
STOP
17
FALSE
FALSE
PU MODE IS SAME,
AS POWERDOWN
END
STOP MODE
18
89
13
FALSE
FALSE
FALSE
TRUE
TRUE
TRUE
TRUE
FALSE
*
ALL
CLEAR
RUN MODE
NOT PRESENT
USD
TRUE
FALSE
STOP MODE
STOP MODE
RUN MODE
STOP MODE
Figure 2-5. Power-Up Sequence
Prior to the START statement on the Power Up Flowchart, the CPU goes through power up
diagnostics which test various periphal devices used by the CPU and tests RAM. After
completing diagnostics, internal data structures and periphal devices used by the CPU get
initialized. The CPU then determines if User Ram has been corrupted. If User Ram is corrupted
the user program and configuration are cleared out and defaulted and all user registers are cleared.