Motorola ColdFire MCF5281 - Manual (Page 555)

Queued Analog-to-Digital Converter (QADC)
Freescale Semiconductor 28-17
28.6.6 Status Registers
This subsection describes the QADC status registers.
28.6.6.1 QADC Status Register 0 (QASR0)
QASR0 contains information about the state of each queue and the current A/D conversion. The bits in
this register are read anytime. For flag bits (CF1, PF1, CF2, PF2, TOR1, TOR2), writing a 1 has no effect;
writing a 0 clears the bit. For QS[9:6] and CWP, writes have no effect. Stop mode resets this register.
The end of a queue is identified in the following cases:
• When execution is complete on the CCW in the location prior to the one
pointed to by BQ2
• When the current CCW contains the end-of-queue code (channel 63) instead of a valid channel
number
01010 Interval timer single-scan mode: time = QCLK period x 2
13
01011 Interval timer single-scan mode: time = QCLK period x 2 14
01100 Interval timer single-scan mode: time = QCLK period x 2 15
01101 Interval timer single-scan mode: time = QCLK period x 2 16
01110 Interval timer single-scan mode: time = QCLK period x 2 17
01111 Reserved mode
10000 Reserved mode
10001 Software triggered continuous-scan mode
10010 Externally triggered rising edge continuous-scan mode
10011 Externally triggered falling edge continuous-scan mode
10100 Periodic timer continuous-scan mode: time = QCLK period x 2
7
10101 Periodic timer continuous-scan mode: time = QCLK period x 2
8
10110 Periodic timer continuous-scan mode: time = QCLK period x 2
9
10111 Periodic timer continuous-scan mode: time = QCLK period x 2
10
11000 Periodic timer continuous-scan mode: time = QCLK period x 2
11
11001 Periodic timer continuous-scan mode: time = QCLK period x 2
12
11010 Periodic timer continuous-scan mode: time = QCLK period x 2
13
11011 Periodic timer continuous-scan mode: time = QCLK period x 2 14
11100 Periodic timer continuous-scan mode: time = QCLK period x 2 15
11101 Periodic timer continuous-scan mode: time = QCLK period x 2 16
11110 Periodic timer continuous-scan mode: time = QCLK period x 2 17
11111 Reserved mode
Table 28-9. Queue 2 Operating Modes (continued)
MQ2[12:8] Operating Modes
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3