MC56F836 Freescale Semiconductor, Inc, MC56F836 Datasheet - Page 116

• Manufacturer Part Number: MC56F836
• Description: 56f8300 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

6.5.2.4
If 1, the EXTR bit indicates an external system reset has occurred. This bit will be cleared by a Power-On
Reset or by software. Writing a 0 to this bit position will set the bit, while writing a 1 to the bit position
will clear it. Basically, when the EXTR bit is 1, the previous system reset was caused by the external
RESET pin being asserted low.
6.5.2.5
When 1, the POR bit indicates a Power-On Reset occurred some time in the past. This bit can only be
cleared by software or by another type of reset. Writing a 0 to this bit will set the bit, while writing a 1 to
the bit position will clear the bit. In summary, if the bit is 1, the previous system reset was due to a
Power-On Reset.
6.5.2.6
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
6.5.3
Only SIM_SCR0 is shown in this section. SIM_SCR1, SIM_SCR2, and SIM_SCR3 are identical in
functionality.
6.5.3.1
This register is reset only by the Power-On Reset (POR). It has no part-specific functionality and is
intended for use by a software developer to contain data that will be unaffected by the other reset sources
(RESET pin, software reset, and COP reset).
6.5.4
This read-only register displays the most significant half of the JTAG ID for the chip. This register reads
$01D6.
116
Base + $2
Base + $6
RESET
Read
Write
Read
Write
POR
SIM Software Control Registers (SIM_SCR0, SIM_SCR1, SIM_SCR2,
and SIM_SCR3)
Most Significant Half of JTAG ID (SIM_MSH_ID)
External Reset (EXTR)—Bit 3
Power-On Reset (POR)—Bit 2
Reserved—Bits 1–0
Software Control Data 1 (FIELD)—Bits 15–0
15
15
Figure 6-6 Most Significant Half of JTAG ID (SIM_MSH_ID)
0
0
0
Figure 6-5 SIM Software Control Register 0 (SIM_SCR0)
14
14
0
0
0
13
13
0
0
0
12
12
0
0
0
56F8365 Technical Data, Rev. 7
11
11
0
0
0
10
10
0
0
0
9
0
9
0
0
FIELD
8
8
0
1
1
7
7
0
1
1
6
6
0
1
1
5
0
5
0
0
4
0
4
1
1
3
3
0
0
0
Freescale Semiconductor
2
0
2
1
1
1
0
1
1
1
Preliminary
0
0
0
0
0