Справочник Пользователя для IBM EM78P259N/260N
EM78P259N/260N
8-Bit Microprocessor with OTP ROM
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Product Specification (V1.2) 05.18.2007
(This specification is subject to change without further notice)
6.2.14 IOC71 (TCCBH/MSB Counter)
The IOC71 (TCCBH) is an 8-bit clock counter for the most significant byte of TCCBX
(TCCBH)
. It can be read, written, and cleared on any reset condition.
When TCCBHE (IOC90) is “0,” then TCCBH is disabled. When TCCBHE is”1,” then
TCCB is a 16-bit length counter.
TCCB is a 16-bit length counter.
NOTE
When TCCBH is Disabled:
■ TCCB time-out period [1/Fosc x ( 256 - TCCB cnt ) x 1(CLK=2)]
■ TCCB time-out period [1/Fosc x ( 256 - TCCB cnt ) x 2(CLK=4)]
■ TCCB time-out period [1/Fosc x ( 256 - TCCB cnt ) x 1(CLK=2)]
■ TCCB time-out period [1/Fosc x ( 256 - TCCB cnt ) x 2(CLK=4)]
When TCCBH is Enabled:
■ TCCB time-out period {1/Fosc x [ 65536 - (TCCBH * 256 + TCCB cnt)] x 1(CLK=2)}
■ TCCB time-out period {1/Fosc x [ 65536 - (TCCBH * 256 + TCCB cnt)] x 2(CLK=4)}
■ TCCB time-out period {1/Fosc x [ 65536 - (TCCBH * 256 + TCCB cnt)] x 1(CLK=2)}
■ TCCB time-out period {1/Fosc x [ 65536 - (TCCBH * 256 + TCCB cnt)] x 2(CLK=4)}
6.2.15 IOC81 (TCCC Counter)
The IOC81 (TCCC) is an 8-bit clock counter that can be extended to 16-bit counter.
It can be read, written, and cleared on any reset condition.
It can be read, written, and cleared on any reset condition.
If HF (Bit 2 of IOCA0) = 1 and IRE (Bit 3 of IOCA0) = 1, TCCC counter scale uses the
low time segments of the pulse generated by Fcarrier frequency modulation (see Fig.
6-12 in Section 6.8.2, Function Description). Then TCCC value will be TCCC predict
value.
low time segments of the pulse generated by Fcarrier frequency modulation (see Fig.
6-12 in Section 6.8.2, Function Description). Then TCCC value will be TCCC predict
value.
When HP = 0 or IRE = 0, the TCCC is an Up Counter.
NOTE
In TCCC Up Counter mode:
■ TCCC time-out period [1/Fosc x scaler (IOCA0) x (256-TCCC cnt) x 1(CLK=2)]
■ TCCC time-out period [1/Fosc x scaler (IOCA0) x (256-TCCC cnt) x 2(CLK=4)]
■ TCCC time-out period [1/Fosc x scaler (IOCA0) x (256-TCCC cnt) x 1(CLK=2)]
■ TCCC time-out period [1/Fosc x scaler (IOCA0) x (256-TCCC cnt) x 2(CLK=4)]
When HP = 1 and IRE = 1, TCCC counter scale uses the low time segments of the
pulse generated by Fcarrier frequency modulation.
pulse generated by Fcarrier frequency modulation.
NOTE
In IR mode:
■ Fcarrier = FT/ 2 { [1+decimal TCCC Counter value (IOC81)]
■ Fcarrier = FT/ 2 { [1+decimal TCCC Counter value (IOC81)]
*
TCCC Scale
(IOCA0) }
■ FT is system clock: FT = Fosc/1 (CLK=2)
FT = Fosc/2 (CLK=4)
FT = Fosc/2 (CLK=4)