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EM78M611E
Universal Serial Bus Series Microcontroller
Product Specification (V1.11) 04.20.2007
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(This specification is subject to change without further notice)
8.2.3.2 CONT (Control Register) Default Value: (0B_0011_1111)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
LED INT TSR2 TSR1 TSR0 PSR2 PSR1 PSR0
Except for Bit 6 (Interrupt enable control bit), the CONT register can be read by the
instruction "CONTR" and written by the instruction “CONTW".
CONT [0~2] Watchdog Timer prescaler bits. These three bits are used as the
Watchdog Timer prescaler.
CONT [3~5] TCC Timer prescaler bits.
The relationship between the prescaler value and these bits are shown below:
PSR2/TSR2 PSR1/TSR1 PSR0/TSR0 TCC Rate WDT Rate
0 0 0 1: 2 1: 1
0 0 1 1: 4 1: 2
0 1 0 1: 8 1: 4
0 1 1 1: 16 1: 8
1 0 0 1: 32 1: 16
1 0 1 1: 64 1: 32
1 1 0 1: 128 1: 64
1 1 1 1: 256 1: 128
NOTE
WDT Timing base is “Power-on time”. Set by the code option [2, 1.]
Ex. Code option [2 ,1] = 01 (2ms), and Prescaler = 1:128.
WDT overflow time is: 2mS * 2^7 = 256 mS
CONT [6] Interrupt enable control bit. This bit toggles Interrupt function between
enable and disable. It is set to 1 by the interrupt disable instruction "DISI"
and reset by the interrupt enable instructions "ENI" or "RETI."
0 : Disable the Interrupt function
1 : Enable the Interrupt function
CONT [7] LED bit. This bit is used to enable the LED sink capacity of P76 and P77.
0 : Disable the LED sink capacity of P76, P77
1 : Enable the LED sink capacity of P76, P77