II CORE BLOCK: BCU (Bus Control Unit)
S1C33L03 FUNCTION PART
EPSON
B-II-4-17
A-1
B-II
BCU
Bus Clock
The bus clock is generated by the BCU using the CPU system clock output from the clock generator.
Figure 4.17 shows the clock system.
High-speed (OSC3)
oscillation circuit
CLKCHG
CLKDT[1:0]
PLLS[1:0] pins
#X2SPD pin
To CPU
OSC3_CLK
PLL_CLK
A
CPU_CLK
BCU_CLK
CPU_CLK
OSC3_CLK
PLL_CLK
Bus clock
PLL
Low-speed (OSC1)
oscillation circuit
CLG
BCU
1/1 or 1/2
1/1–1/8
BCLKSEL[1:0]
SDRENA
SD_CLK
SDRAMC
1/1 or 1/2
Refresh
counter
BCLK pin
PLL_CLK and CPU_CLK
BCU_CLK
SD_CLK (When #X2SPD = "1")
OSC3_CLK (PLL: off)
PLL_CLK (PLL: x2 mode)
PLL_CLK (PLL: x4 mode)
A
CPU_CLK (CLKDT = 1/1)
CPU_CLK (CLKDT = 1/2)
CPU_CLK (CLKDT = 1/4)
CPU_CLK (CLKDT = 1/8)
CPU_CLK
BCU_CLK (#X2SPD = "1", x1 speed mode)
BCU_CLK (#X2SPD = "0", x2 speed mode)
(when the CPU system clock source is OSC3)
∗
1
∗
1 Access to the internal RAM
∗
2 Access to the external memory (other than SDRAM)
∗
3 Access to the SDRAM
∗
1
∗
1
∗
1
∗
2
∗
1
∗
2
∗
2
∗
3
∗
2
∗
1
∗
1
∗
2
#SDCEx
CPU_CLK
BCU_CLK
SD_CLK (SDRCLK = "1")
SD_CLK (SDRCLK = "0")
SDCKE
Self refresh
SD_CLK (When #X2SPD = "0")
∗
3
∗
2
∗
1
#SDCEx
CPU_CLK
BCU_CLK
SD_CLK (SDRCLK = "1")
SD_CLK (SDRCLK = "0")
SDCKE
Self refresh
Figure 4.17 Clock System
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 147: ...S1C33L03 FUNCTION PART ...
Page 148: ......
Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
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Page 152: ...I OUTLINE INTRODUCTION B I 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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 166: ...II CORE BLOCK INTRODUCTION B II 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 172: ...II CORE BLOCK CPU AND OPERATING MODE B II 2 6 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 224: ...II CORE BLOCK BCU Bus Control Unit B II 4 48 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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 266: ...III PERIPHERAL BLOCK INTRODUCTION B III 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 322: ...III PERIPHERAL BLOCK WATCHDOG TIMER B III 5 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
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Page 418: ...IV ANALOG BLOCK INTRODUCTION B IV 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 434: ...IV ANALOG BLOCK A D CONVERTER B IV 2 16 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
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Page 438: ...V DMA BLOCK INTRODUCTION B V 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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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