Table of Contents
Advertisement
M16C/64C Group
CM13 (XIN-XOUT feedback resistor select bit) (b3)
The CM13 bit can be used when the main clock is not used at all, or when the externally generated
clock is supplied to the XIN pin. When connecting a ceramic resonator or crystal between pins XIN and
XOUT, set the CM13 bit to 0 (internal feedback resistor connected). Do not set this bit to 1.
When the CM10 bit is 1 (stop mode), the feedback resistor is not connected regardless of the CM13 bit
value.
CM14 (125 kHz on-chip oscillator stop bit) (b4)
The CM14 bit can be set to 1 (125 kHz on-chip oscillator off) when the CM21 bit is 0 (main clock or PLL
clock). When the CM21 bit is set to 1 (on-chip oscillator clock), the CM14 bit is automatically set to 0
(125 kHz on-chip oscillator on) and remains unchanged even when 1 is written to this bit. Note that the
125 kHz on-chip oscillator does not stop.
When the CSPRO bit in the CSPR register is 1 (watchdog timer count source protection mode), the
CM14 bit is automatically set to 0 (125 kHz on-chip oscillator on) and remains unchanged even when 1
is written to this bit. Note that the 125 kHz on-chip oscillator does not stop.
CM15 (XIN-XOUT drive capacity select bit) (b5)
In the following cases, the CM15 bit is fixed as 1 (drive capacity high):
•
Entering stop mode.
•
The CM21 bit in the CM2 register is 0 (main clock or PLL clock) and the CM05 bit in the CM0
register is set to 1 (main clock stopped).
CM17 and CM16 (Main clock division select bit 1) (b7-b6)
Bits CM17 and CM16 are enabled when the CM06 bit is 0 (bits CM17 and CM16 enabled).
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
8. Clock Generator
Page 90 of 807
Advertisement
Table of Contents
