23.8.2.1 Clock Generation The Clock Waveform Generator Register (CWGR) is used to control the waveform of the TW" />
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445
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UC3D
23.8.2.1
Clock Generation
The Clock Waveform Generator Register (CWGR) is used to control the waveform of the TWCK
clock. CWGR must be written so that the desired TWI bus timings are generated. CWGR
describes bus timings as a function of cycles of a prescaled clock. The clock prescaling can be
selected through the Clock Prescaler field in CWGR (CWGR.EXP).
CWGR has the following fields:
LOW: Prescaled clock cycles in clock low count. Used to time TLOW and TBUF.
HIGH: Prescaled clock cycles in clock high count. Used to time THIGH.
STASTO: Prescaled clock cycles in clock high count. Used to time THD_STA, TSU_STA, TSU_STO.
DATA: Prescaled clock cycles for data setup and hold count. Used to time THD_DAT, TSU_DAT.
EXP: Specifies the clock prescaler setting.
Note that the total clock low time generated is the sum of THD_DAT + TSU_DAT + TLOW.
Any slave or other bus master taking part in the transfer may extend the TWCK low period at any
time.
The TWIM hardware monitors the state of the TWCK line as required by the IC specification.
The clock generation counters are started when a high/low level is detected on the TWCK line,
not when the TWIM hardware releases/drives the TWCK line. This means that the CWGR set-
tings alone do not determine the TWCK frequency. The CWGR settings determine the clock low
time and the clock high time, but the TWCK rise and fall times are determined by the external cir-
cuitry (capacitive load, etc.).
Figure 23-5. Bus Timing Diagram
fPRESCALER
fCLK_TWIM
2
EXP 1
+
()
--------------------------
=
S
t
HD:STA
t LOW
t
SU:DAT
t HIGH
t
HD:DAT
t LOW
P
t
SU:STO
Sr
t
SU:STA
t
SU:DAT
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
VI-B72-IW-F2 CONVERTER MOD DC/DC 15V 100W
V24C12H150B2 CONVERTER MOD DC/DC 12V 150W
VI-B71-IX-F3 CONVERTER MOD DC/DC 12V 75W
VI-B71-IX-F2 CONVERTER MOD DC/DC 12V 75W
VI-B71-IX-F1 CONVERTER MOD DC/DC 12V 75W
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ATUC128D4-Z1UR 鍔熻兘鎻忚堪:32浣嶅井鎺у埗鍣� - MCU UC3D4 128KB FL 85C RoHS:鍚� 鍒堕€犲晢:Texas Instruments 鏍稿績:C28x 铏曠悊鍣ㄧ郴鍒�:TMS320F28x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:32 bit 鏈€澶ф檪閻橀牷鐜�:90 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:64 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:26 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:2.97 V to 3.63 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:LQFP-80 瀹夎棰�(f膿ng)鏍�:SMD/SMT
ATUC128D4-Z1UT 鍔熻兘鎻忚堪:32浣嶅井鎺у埗鍣� - MCU UC3D4 128KB FL 85C RoHS:鍚� 鍒堕€犲晢:Texas Instruments 鏍稿績:C28x 铏曠悊鍣ㄧ郴鍒�:TMS320F28x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:32 bit 鏈€澶ф檪閻橀牷鐜�:90 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:64 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:26 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:2.97 V to 3.63 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:LQFP-80 瀹夎棰�(f膿ng)鏍�:SMD/SMT
ATUC128L3U-AUR 鍔熻兘鎻忚堪:32浣嶅井鎺у埗鍣� - MCU UC3L-128KB Flash 64QFP 85C green T&R RoHS:鍚� 鍒堕€犲晢:Texas Instruments 鏍稿績:C28x 铏曠悊鍣ㄧ郴鍒�:TMS320F28x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:32 bit 鏈€澶ф檪閻橀牷鐜�:90 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:64 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:26 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:2.97 V to 3.63 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:LQFP-80 瀹夎棰�(f膿ng)鏍�:SMD/SMT
ATUC128L3U-AUT 鍔熻兘鎻忚堪:32浣嶅井鎺у埗鍣� - MCU UC3L-128KB Flash 64QFP 85C green TRAY RoHS:鍚� 鍒堕€犲晢:Texas Instruments 鏍稿績:C28x 铏曠悊鍣ㄧ郴鍒�:TMS320F28x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:32 bit 鏈€澶ф檪閻橀牷鐜�:90 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:64 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:26 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:2.97 V to 3.63 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:LQFP-80 瀹夎棰�(f膿ng)鏍�:SMD/SMT