s908ey16g2vfar Freescale Semiconductor, Inc, s908ey16g2vfar Datasheet - Page 160

• Manufacturer Part Number: s908ey16g2vfar
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Enhanced Serial Communications Interface (ESCI) Module
ACLK — Arbiter Counter Clock Select Bit
AFIN— Arbiter Bit Time Measurement Finish Flag
ARUN— Arbiter Counter Running Flag
AROVFL— Arbiter Counter Overflow Bit
ARD8— Arbiter Counter MSB
13.9.2 ESCI Arbiter Data Register
ARD7–ARD0 — Arbiter Least Significant Counter Bits
160
This read/write bit selects the arbiter counter clock source. Reset clears ACLK.
This read-only bit indicates bit time measurement has finished. Clear AFIN by writing any value to
SCIACTL. Reset clears AFIN.
This read-only bit indicates the arbiter counter is running. Reset clears ARUN.
This read-only bit indicates an arbiter counter overflow. Clear AROVFL by writing any value to
SCIACTL. Writing 0s to AM1 and AM0 resets the counter keeps it in this idle state. Reset clears
AROVFL.
This read-only bit is the MSB of the 9-bit arbiter counter. Clear ARD8 by writing any value to SCIACTL.
Reset clears ARD8.
These read-only bits are the eight LSBs of the 9-bit arbiter counter. Clear ARD7–ARD0 by writing any
value to SCIACTL. Writing 0s to AM1 and AM0 permanently resets the counter and keeps it in this idle
state. Reset clears ARD7–ARD0.
1 = Arbiter counter is clocked with one quarter of the ESCI input clock generated by the ESCI
0 = Arbiter counter is clocked with the bus clock divided by four
1 = Bit time measurement has finished
0 = Bit time measurement not yet finished
1 = Arbiter counter running
0 = Arbiter counter stopped
1 = Arbiter counter overflow has occurred
0 = No arbiter counter overflow has occurred
prescaler.
Address: $0019
For ACLK=1, the Arbiter input clock is driven from the ESCI prescaler. The
prescaler can be clocked by either the bus clock or CGMXCLK depending
on the state of the ESCIBDSRC bit in CONFIG2.
Reset:
Read:
Write:
ARD7
Bit 7
Figure 13-20. ESCI Arbiter Data Register (SCIADAT)
0
MC68HC908EY16A • MC68HC908EY8A Data Sheet, Rev. 1
= Unimplemented
ARD6
6
0
ARD5
5
0
NOTE
ARD4
4
0
ARD3
3
0
ARD2
2
0
ARD1
1
0
Freescale Semiconductor
ARD0
Bit 0
0