22-4
MSM66591/ML66592 User's Manual
Chapter 22 Expansion Port
Figure 22-4 Output Mode Timing (8-Bit Mode Example)
SFTDAT
(shift data)
SFTCLK (1/4 CLK)
(shift clock)
SFTSTB
(data latch)
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
[2]
Output Mode
In the output mode, it is assumed that a 74HC595 or other shift register is connected
externally.
Writing data to EXPTD causes the transfer (output) to start and the EXPBUSY flag to
change to "1". When data is written to EXPTD, shift data is output in sync with the fall of
the shift clock (SFTCLK). It is assumed that data is captured externally in sync with the
rise of SFTCLK. When SFTCLK outputs 8 clocks, the transfer (output) is completed. At
the same time, SFTSTB changes to a "L" level. 1 shift clock later SFTSTB changes to a
"H" level and data is latched externally. (During this 1 shift clock interval, the shift clock
is not output.) And at the same time that SFTSTB changes to a "H" level, the EXPBUSY
flag becomes "0". SFTCLK is fixed at 1/4 CLK (1/4 of the internal clock).
During the 16-bit mode, SFTCLK outputs 16 clocks and 16-bit transfers are performed.
Figure 22-4 shows the timing of the output mode.
Содержание MSM66591
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002...
Страница 15: ...Contents 12...
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Страница 18: ...Overview Chapter 1 1...
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Страница 30: ...Description of Pins Chapter 2 2...
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Страница 44: ...CPU Architecture Chapter 3 3...
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Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
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Страница 112: ...Memory Control Functions Chapter 5 5...
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Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
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Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
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Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Страница 156: ...Clock Generation Circuit Chapter 8 8...
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Страница 348: ...A D Converter Functions Chapter 16 16...
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Страница 388: ...Peripheral Functions Chapter 18 18...
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Страница 442: ...25 Electrical Characteristics Chapter 25...
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