MC68HC908BD48 Datasheet, PDF (90/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

System Integration Module (SIM)
Table 7-1. SIM I/O Register Summary
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
SBSW
$FE00
SIM
Break
Status Register
(SBSR)
Write:
R
R
R
R
R
R
R
Note
Reset: 0
0
0
0
0
0
0
0
Read: POR
PIN
COP ILOP ILAD
0
0
0
$FE01
SIM Reset Status
Register (SRSR)
Write:
POR: 1
0
0
0
0
0
0
0
Read:
$FE03
SIM Break Flag Control
Register (SBFCR)
Write:
BCFE
R
R
R
R
R
R
R
Reset: 0
Read: IF6
IF5
IF4
IF3
IF2
IF1
0
0
$FE04
Interrupt Status Register 1
(INT1)
Write:
R
R
R
R
R
R
R
R
Reset: 0
0
0
0
0
0
0
0
Interrupt Status Register 2 ^{Read: 0}
0
0
0
IF10
IF9
IF8
IF7
$FE05
(INT2) Write: R
R
R
R
R
R
R
R
Reset: 0
0
0
0
0
0
0
0
Note: Writing a logic 0 clears SBSW.
= Unimplemented
R = Reserved
Table 7-2 shows the internal signal names used in this section.
Table 7-2. Signal Name Conventions
Signal Name
OSCXCLK
OSCOUT
IAB
IDB
PORRST
IRST
R/W
Description
Buffered version of OSC1 from the oscillator
The OSCXCLK frequency divided by two. This signal is again
divided by two in the SIM to generate the internal bus clocks.
(Bus clock = OSCXCLK divided by four)
Internal address bus
Internal data bus
Signal from the power-on reset module to the SIM
Internal reset signal
Read/write signal
Technical Data
90
System Integration Module (SIM)
MC68HC908BD48 — Rev. 1.0
MOTOROLA