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M34282M2-XXXGP Datasheet(PDF) 4 Page - Renesas Technology Corp |
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M34282M2-XXXGP Datasheet(HTML) 4 Page - Renesas Technology Corp |
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4 / 69 page  Rev.1.33 Mar 18, 2004 page 4 of 67 4282 Group CONNECTIONS OF UNUSED PINS Pin D0–D7 E0, E1 E2 G0–G3 Connection Open or connect to VDD pin (Note 1). Set the output latch to “1” and open, or connect to VDD pin (Note 2). Open or connect to VSS pin. Set the output latch to “1” and open, or connect to VDD pin (Note 2). Notes 1: Ports D4–D7: Set the bit 2 (PU02) of the pull-down control register PU1 to “0” by software and turn the pull-down transistor OFF. 2: Set the corresponding bits of the pull-down control register PU0 to “0” by software and turn the pull-down transistor OFF. (Note in order to set the output latch to “1” to make pins open) • After system is released from reset, a port is in a high-impedance state until the output latch of the port is set to “1” by software. Accordingly, the voltage level of pins is undefined and the excess of the supply current may occur. • To set the output latch periodically is recommended because the value of output latch may change by noise or a program run away (caused by noise). (Note when connecting to VSS and VDD) • Connect the unused pins to VSS or VDD at the shortest distance and use the thick wire against noise. PORT FUNCTION Control bits 1 bit Output: 2 bits Input: 3 bits 4 bits 1 bit Control instructions SD RD CLD SD RD CLD SZD OEA IAE IAE OGA IAG SCAR RCAR Control registers PU1 PU0 PU0 Output structure P-channel open-drain P-channel open-drain P-channel open-drain CMOS Input/ Output Output (4) I/O (4) I/O (2) Input (1) I/O (4) Output (1) Remark Pull-down function and key-on wakeup function (programmable) Pull-down function and key-on wakeup function (programmable) Pull-down function and key-on wakeup function (programmable) Pin D0–D3 D4–D7 E0 E1 E2 G0–G3 CARR Port Port D Port E Port G Port CARR DEFINITION OF CLOCK AND CYCLE • System clock (STCK) The system clock is the source clock for controlling this product. It can be selected as shown below whether to use the CCK instruction. CCK instruction When not using When using Instruction clock f(XIN)/32 f(XIN)/4 System clock f(XIN)/8 f(XIN) • Instruction clock (INSTCK) The instruction clock is a signal derived by dividing the system clock by 4, and is the basic clock for controlling CPU. The one instruction clock cycle is equivalent to one machine cycle. • Machine cycle The machine cycle is the cycle required to execute the instruction. |
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