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M37733MHB242FP Datasheet(PDF) 6 Page - Mitsubishi Electric Semiconductor |
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M37733MHB242FP Datasheet(HTML) 6 Page - Mitsubishi Electric Semiconductor |
6 / 34 page 6 MITSUBISHI MICROCOMPUTERS M37733EHBXXXFP M37733EHBFS PROM VERSION OF M37733MHBXXXFP PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. BASIC FUNCTION BLOCKS The M37733EHBXXXFP has the same functions as the M37733MHBXXXFP except for the following: (1) The built-in ROM is PROM. (2) The status of bit 3 of the oscillation circuit control register 1 (address 6F16) at a reset is different. (3) The usage condition of bit 3 of the oscillation circuit control register 1 is different. Accordingly, refer to the basic function blocks description in the M37733MHBXXXFP except for Figure 1 (bit configuration of the oscillation circuit control register 1) and Figure 3 (microcomputer internal status during reset). In the M37733EHBXXXFP, bit 3 of the oscillation circuit control register 1 must be “1”. (Refer to Figure 1.) The status of this bit at a reset is “1”. Fig. 2 How to write data in oscillation circuit control register 1 (identical with Figure 64 in data sheet “M37733MHBXXXFP”) Writing data “8016” (LDM instruction) Reset clock prescaler Writing data “5516” (LDM instruction) Writing data “0Y16” (LDM instruction) CC2 to CC0 selection bits • How to reset clock prescaler • How to write in CC2 to CC0 selection bits Note. “Y” is the sum of bits to be set. For example, when setting bits 2 and 1 to “1”, “Y” becomes “6”. Next instruction Note. Write to the oscillation circuit control register 1 as the flow shown in Figure 2. Oscillation circuit control register 1 Main clock division selection bit 0 : Main clock is divided by 2. 1 : Main clock is not divided by 2. Main clock external input selection bit 0 : Main-clock oscillation circuit is operating by itself. Watchdog timer is used at returning from STP state. 1 : Main-clock is input externally. Watchdog timer is not used at returning from STP state. Sub clock external input selection bit 0 : Sub-clock oscillation circuit is operating by itself. Port P76 functions as XCOUT pin. Watchdog timer is used at returning from STP state. 1 : Sub-clock is input externally. Port P76 functions as I/O port. Watchdog timer is not used at returning from STP state. 1 : Always “1” (“1” at reset) 0 : Always “0” (However, writing data “5516” shown in Figure 2 is possible.) Clock prescaler reset bit Address 6F16 CC0 CC1 CC2 0 76543 2 1 0 1 Fig. 1 Bit configuration of oscillation circuit control register 1 (corresponding to Figure 63 in data sheet “M37733MHBXXXFP”) |
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