MC56F836 Freescale Semiconductor, Inc, MC56F836 Datasheet - Page 37

• Manufacturer Part Number: MC56F836
• Description: 56f8300 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

Note:
3.2.3
The recommended method of connecting an external clock is illustrated in
source is connected to XTAL and the EXTAL pin is grounded.
external clock source as well.
3.3 Registers
When referring to the register definitions for the OCCS in the 56F8300 Peripheral User Manual, use the
register definitions without the internal Relaxation Oscillator, since the 56F8365/56F8165 devices do
NOT contain this oscillator.
Part 4 Memory Map
4.1 Introduction
The 56F8365 and 56F8165 devices are 16-bit motor-control chips based on the 56800E core. These parts
use a Harvard-style architecture with two independent memory spaces for Data and Program. On-chip
RAM and Flash memories are used in both spaces.
This section provides memory maps for:
Freescale Semiconductor
Preliminary
2 Terminal
CL1
The OCCS_COHL bit must be set to 0 when a ceramic resonator is used. The reset condition on the
OCCS_COHL bit is 0. Please see the COHL bit in the Oscillator Control (OSCTL) register, discussed
in the 56F8300 Peripheral User Manual.
External Clock Source
EXTAL XTAL
R
Figure 3-4 Connecting an External Clock Signal Register
z
CL2
Figure 3-3 Connecting a Ceramic Resonator
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
External
XTAL
Clock
C1
3 Terminal
EXTAL XTAL
56F8365 Technical Data, Rev. 7
EXTAL
R
V
SS
z
C2
Note: When using an external clocking source
with this configuration, the input “CLKMODE”
should be high and the COHL bit in the OSCTL
register should be set to 1.
Sample External Ceramic Resonator Parameters:
R
z
= 750 KΩ
Set OCCS_COHL bit high when using an
CLKMODE = 0
Figure
3-4. The external clock
Registers
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