S912XEP768J5MAGR Freescale Semiconductor, S912XEP768J5MAGR Datasheet - Page 316

• Manufacturer Part Number: S912XEP768J5MAGR
• Description: 16-bit Microcontrollers - MCU 16-bit 768K Flash
• Manufacturer: Freescale Semiconductor

Specifications of S912XEP768J5MAGR

• Rohs: yes
• Core: HCS12X
• Processor Series: MC9S12
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 768 KB
• Data Ram Size: 48 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3.3 V to 5 V
• Operating Temperature Range: - 40 C to + 125 C
• Package / Case: LQFP-144
• Mounting Style: SMD/SMT

Chapter 8 S12X Debug (S12XDBGV3) Module
8.3.2.6
Read: Anytime
Write: Never
316
Address: 0x0026
CNT[6:0]
Reset
Field
POR
6–0
W
R
1. This applies to Normal/Loop1/PurePC Modes when tracing from either CPU12X or XGATE only.
TBF (DBGSR)
Count Value — The CNT bits [6:0] indicate the number of valid data 64-bit data lines stored in the Trace Buffer.
Table 8-20
When the CNT rolls over to zero, the TBF bit in DBGSR is set and incrementing of CNT will continue in end-
trigger or mid-trigger mode. The DBGCNT register is cleared when ARM in DBGC1 is written to a one. The
DBGCNT register is cleared by power-on-reset initialization but is not cleared by other system resets. Thus
should a reset occur during a debug session, the DBGCNT register still indicates after the reset, the number of
valid trace buffer entries stored before the reset occurred. The DBGCNT register is not decremented when
reading from the trace buffer.
Debug Count Register (DBGCNT)
0
0
0
7
0
0
0
0
1
1
= Unimplemented or Reserved
shows the correlation between the CNT bits and the number of valid data lines in the Trace Buffer.
—
0
6
CNT[6:0]
0000000
0000001
0000010
0000100
0000110
1111100
1111110
0000000
0000010
1111110
Figure 8-8. Debug Count Register (DBGCNT)
..
..
..
MC9S12XE-Family Reference Manual Rev. 1.25
Table 8-19. DBGCNT Field Descriptions
Table 8-20. CNT Decoding Table
—
0
5
oldest data has been overwritten by most recent data
ARM bit will be cleared and the tracing session ends.
64 lines valid; if using Begin trigger alignment,
—
0
4
Description
32 bits of one line valid
CNT
—
64 lines valid,
No data valid
62 lines valid
63 lines valid
0
3
Description
2 lines valid
3 lines valid
1 line valid
..
—
0
2
(1)
Freescale Semiconductor
—
0
1
—
0
0