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3802 数据表(PDF) 29 Page - Renesas Technology Corp |
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3802 数据表(HTML) 29 Page - Renesas Technology Corp |
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29 / 52 page  MITSUBISHI MICROCOMPUTERS 3802 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 28 Note. ! : Undefined V : The initial values of CM1 are determined by the level at the CNVSS pin. The contents of all other registers and RAM are undefined after a reset, so they must be initialized by software. Register contents (000116) · · · Prescaler X Port P0 direction register Port P1 direction register Port P2 direction register Port P3 direction register Port P4 direction register Port P5 direction register Port P6 direction register Serial I/O1 status register Serial I/O1 control register Timer X UART control register Serial I/O2 control register Prescaler 12 Timer 1 Timer XY mode register (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (29) (30) (31) (000316) · · · (000516) · · · (000716) · · · (000916) · · · (000B16) · · · (000D16) · · · (001916) · · · (001A16) · · · (001B16) · · · (001D16) · · · (002016) · · · (002116) · · · (002216) · · · (002316) · · · (002416) · · · (002516) · · · (002616) · · · (002716) · · · (002B16) · · · (003416) · · · (003616) · · · (003716) · · · (003A16) · · · (003B16) · · · (003C16) · · · (003D16) · · · (003E16) · · · Address Timer 2 Prescaler Y Timer Y PWM control register AD/DA control register D-A1 conversion register D-A2 conversion register Interrupt edge selection register CPU mode register Interrupt request register 1 Interrupt request register 2 Interrupt control register 1 Interrupt control register 2 Processor status register Program counter 0016 0016 0016 0016 0016 0016 0016 FF16 FF16 FF16 FF16 0016 FF16 0116 0016 0016 0016 11 1 0 0 0 0 0 0016 0016 0016 Contents of address FFFC16 !! ! ! ! 1 ! ! (PS) (PCH) (PCL) Contents of address FFFD16 0016 0016 0016 (003F16) · · · 10 0 0 0 0 0 0 FF16 00 0 0 1 0 0 0 0016 00 0 0 0 0 0 V Reset Circuit To reset the microcomputer, the RESET pin should be held at an “L” level for 2 µs or more. Then the RESET pin is returned to an “H” level (the power source voltage should be between 4.0 V and 5.5 V), reset is released. Internal operation begin until after 8 to 13 XIN clock cycles are completed. After the reset is completed, the pro- gram starts from the address contained in address FFFD16 (high- order byte) and address FFFC16 (low-order byte). Make sure that the reset input voltage is less than 0.6 V for VCC of 3.0 V (Extended operating temperature version : the reset input voltage is less than 0.8 V for VCC of 4.0 V). Fig. 27 Internal status of microcomputer after reset Fig. 26 Example of reset circuit 4.0V 0.8V 0V 0V VCC RESET Power source voltage Reset input voltage VSS M51953AL 4 5 1 3 0.1 µ F 3802 group |
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