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4501 Datasheet(PDF) 6 Page - Renesas Technology Corp |
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4501 Datasheet(HTML) 6 Page - Renesas Technology Corp |
6 / 116 page Rev.3.01 2005.02.07 page 6 of 112 REJ03B0104-0301 4501 Group DEFINITION OF CLOCK AND CYCLE q Operation source clock The operation source clock is the source clock to operate this product. In this product, the following clocks are used. • External ceramic resonator • External RC oscillation • Clock (f(XIN)) by the external clock • Clock (f(RING)) of the on-chip oscillator which is the internal oscillator. q System clock The system clock is the basic clock for controlling this product. The system clock is selected by the bits 2 and 3 of the clock con- trol register MR. Register MR System clock (Note 1) f(XIN) or f(RING) f(XIN)/2 or f(RING)/2 f(XIN)/4 or f(RING)/4 f(XIN)/8 or f(RING)/8 Table Selection of system clock PORT FUNCTION Port Port D Port P0 Port P1 Port P2 I/O unit 1 4 4 2 Control instructions SD, RD SZD, CLD SCP, RCP SNZCP IAK, OKA OP0A IAP0 OP1A IAP1 OP2A IAP2 Control registers PU2, K2 PU0, K0 PU1, K1 W6, I1 PU2, K2 Q1 Output structure N-channel open-drain N-channel open-drain N-channel open-drain N-channel open-drain Input Output I/O (4) I/O (4) I/O (4) I/O (2) Remark Pin D0, D1 D2/C D3/K P00–P03 P10, P11 P12/CNTR, P13/INT P20/AIN0 P21/AIN1 Notes 1: The on-chip oscillator clock is f(RING), the clock by the ceramic resonator, RC oscillation or external clock is f(XIN). 2: The default mode is selected after system is released from reset and is returned from RAM back-up. MR2 0 1 0 1 MR3 0 0 1 1 Operation mode High-speed mode Middle-speed mode Low-speed mode Default mode q Instruction clock The instruction clock is a signal derived by dividing the system clock by 3. The one instruction clock cycle generates the one machine cycle. q Machine cycle The machine cycle is the standard cycle required to execute the instruction. Built-in programmable pull-up functions Key-on wakeup functions (programmable) Built-in programmable pull-up functions Key-on wakeup functions (programmable) Built-in programmable pull-up functions Key-on wakeup functions (programmable) Built-in programmable pull-up functions Key-on wakeup functions (programmable) |
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