PXD20RM Datasheet, PDF (201/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

• Supports multiple clock sources and maps their address spaces to its memory map
• Generates an output clock
• Guarantees glitch-less clock transitions when changing the system clock selection
• Supports 8, 16 and 32-bit wide read/write accesses
8.3.2 External signal description
The MC_CGM delivers an output clock to the PF[15] pin for off-chip use and/or observation.
8.3.3 Memory map and register definition
Table 8-2. MC_CGM register description
Address
Name
0xC3FE- CGM_VIU_MUX
0340
0xC3FE CGM_OC_EN
_0370
0xC3FE CGM_OCDS_SC
_0374
0xC3FE CGM_SC_SS
_0378
0xC3FE CGM_SC_DC0
_037C
0xC3FE CGM_SC_DC1
_037D
0xC3FE CGM_SC_DC2
_037E
0xC3FE CGM_SC_DC3
_037F
0xC3FE CGM_AC0_SC
_0380
0xC3FE CGM_AC0_DC
_0384
0xC3FE CGM_AC1_SC
_0388
0xC3FE CGM_AC1_DC
_038C
0xC3FE CGM_AC2_SC
_0390
0xC3FE CGM_AC2_DC
_0394
Description
VIU2 multiplex select
Size
User
Access
Supervisor
Test
Location
word read read/write read/write on page 8-11
Output Clock Enable word read read/write read/write on page 8-12
Output Clock Division
Select
System Clock Select
Status
System Clock Divider
Configuration 0
System Clock Divider
Configuration 1
System Clock Divider
Configuration 2
System Clock Divider
Configuration 3
Aux Clock 0 Select
Control
Aux Clock 0 Divider
Configuration
Aux Clock 1 Select
Control
Aux Clock 1 Divider
Configuration
Aux Clock 2 Select
Control
Aux Clock 2 Divider
Configuration
byte read
byte read
byte read
byte read
byte read
byte read
word read
byte read
word read
byte read
word read
byte read
read/write read/write on page 8-13
read
read on page 8-14
read/write read/write on page 8-15
read/write read/write on page 8-15
read/write read/write on page 8-15
read/write read/write on page 8-15
read/write read/write on page 8-16
read/write read/write on page 8-17
read/write read/write on page 8-17
read/write read/write on page 8-18
read/write read/write on page 8-19
read/write read/write on page 8-20
PXD20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
8-5
Preliminary—Subject to Change Without Notice