Technical data
MOTOROLA MC68HC912B32
114 MC68HC912B32TS/D
RST — Module Reset Bit
When set, this bit causes all registers and activity in the module to assume the same state as out of
power-on reset (except for ADPU bit in ATDCTL2, which remains set, allowing the ATD module to re-
main enabled).
TSTOUT — Multiplex Output of TST[3:0] (Factory Use)
TST[3:0] — Test Bits 3 to 0 (Reserved)
Selects one of 16 reserved factory testing modes.
PAD[7:0] — Port AD Data Input Bits
After reset these bits reflect the state of the input pins.
May be used for general-purpose digital input. When the software reads PORTAD, it obtains the digital
levels that appear on the corresponding port AD pins. Pins with signals not meeting V
IL
or V
IH
specifi-
cations will have an indeterminate value. Writes to this register have no meaning at any time.
ADRxH[7:0] — ATD Conversion Result
The reset condition for these registers is undefined.
These bits contain the left justified, unsigned result from the ATD conversion. The channel from which
this result was obtained is dependent on the conversion mode selected. These registers are always
read-only in normal mode.
15.3 ATD Mode Operation
STOP — causes all clocks to halt (if the S bit in the CCR is zero). The system is placed in a minimum-
power standby mode. This aborts any conversion sequence in progress. During STOP recovery, the
ATD must delay for the STOP recovery time (t
SR
) before initiating a new ATD conversion sequence.
WAIT — ATD conversion continues unless AWAI bit in ATDCTL2 register is set.
BDM — Debug options available as set in register ATDCTL3.
USER — ATD continues running unless ADPU is cleared.
ADPU — ATD operations are stopped if ADPU = 0, but registers are accessible.
PORTAD — Port AD Data Input Register $006F
Bit 7 6 5 4 3 2 1 Bit 0
PAD7 PAD6 PAD5 PAD4 PAD3 PAD2 PAD1 PAD0
RESET: – – – – – – – –
ADR0H — ATD Converter Result Register 0 $0070
ADR1H — ATD Converter Result Register 1 $0072
ADR2H — ATD Converter Result Register 2 $0074
ADR3H — ATD Converter Result Register 3 $0076
ADR4H — ATD Converter Result Register 4 $0078
ADR5H — ATD Converter Result Register 5 $007A
ADR6H — ATD Converter Result Register 6 $007C
ADR7H — ATD Converter Result Register 7 $007E
$007x Bit 7 6 5 4 3 2 1 Bit 0
Bit 7 6 5 4 3 2 1 Bit 0
RESET: – – – – – – – –