II CORE BLOCK: BCU (Bus Control Unit)
S1C33L03 FUNCTION PART
EPSON
B-II-4-47
A-1
B-II
BCU
SDRENA: Enable SDRAM signals (D7) / SDRAM control register (0x39FFC1)
Enable the pins used for the SDRAM.
Write "1": Enabled
Write "0": Disabled
Read: Valid
Writing "1" to SDRENA sets the pins shared with other functions to be used for the SDRAM, with the SDRAM
clock output from the BCLK pin. If SDRENA = "0", the shared pins serve other functions.
The SDRAM clock output from the BCLK pin is stopped in the HALT2 and the SLEEP modes.
At cold start, SDRENA is set to "0" (disabled). At hot start, SDRENA retains its status before being initialized.
A1X1MD: Area 1 access speed (D3) / BCLK select register (0x4813A)
Select a number of access cycles for area 1 in x2 speed mode.
Write "1": 2 cycles
Write "0": 4 cycles
Read: Valid
When x2 speed mode is set (#X2SPD pin = "0") and A1X1MD = "1", area 1 is read/written in 2 cycles of the CPU
system clock.
When A1X1MD = "0", area 1 is read/written in 4 cycles.
When x1 speed mode is set (#X2SPD pin = "1"), area 1 is always accessed in 2 cycles regardless of the A1X1MD
value.
At cold start, A1X1MD is set to "0" (4 cycles). At hot start, A1X1MD retains its status before being initialized.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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Page 15: ...S1C33L03 PRODUCT PART ...
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Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
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Page 162: ...I OUTLINE LIST OF PINS B I 3 8 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
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Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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Page 262: ...II CORE BLOCK DBG Debug Unit B II 7 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
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Page 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
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Page 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
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Page 492: ...V DMA BLOCK IDMA Intelligent DMA B V 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
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Page 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
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Page 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
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