MC68HC08BD24 Datasheet, PDF (158/244 Pages) Motorola, Inc – HCMOS Microcontroller Unit

13.6.3 DDC Control Register (DCR)
Address: $0018
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
DEN
DIEN
Write:
0
0
TXAK SCLIEN DDC1EN
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 13-3. DDC Control Register (DCR)
DEN — DDC Enable
This bit is set to enable the DDC module. When DEN = 0, module is
disabled and all flags will restore to its power-on default states. Reset
clears this bit.
1 = DDC module enabled
0 = DDC module disabled
DIEN — DDC Interrupt Enable
When this bit is set, the TXIF, RXIF, ALIF, and NAKIF flags are
enabled to generate an interrupt request to the CPU. When DIEN is
cleared, the these flags are prevented from generating an interrupt
request. Reset clears this bit.
1 = TXIF, RXIF, ALIF, and/or NAKIF bit set will generate interrupt
request to CPU
0 = TXIF, RXIF, ALIF, and/or NAKIF bit set will not generate
interrupt request to CPU
TXAK — Transmit Acknowledge Enable
This bit is set to disable the DDC from sending out an acknowledge
signal to the bus at the 9th clock bit after receiving 8 data bits. When
TXAK is cleared, an acknowledge signal will be sent at the 9th clock
bit. Reset clears this bit.
1 = DDC does not send acknowledge signals at 9th clock bit
0 = DDC sends acknowledge signal at 9th clock bit
Technical Data
158
MC68HC08BD24 — Rev. 1.1
Freescale Semiconductor