
7540 Group User’s Manual
v
Fig. 49 Processing of X
IN
and X
OUT
pins at ring oscillator operation....................................1-45
Fig. 50 Structure of MISRG........................................................................................................1-46
Fig. 51 Block diagram of internal clock generating circuit (for ceramic resonator) ...........1-47
Fig. 52 Block diagram of internal clock generating circuit (for RC oscillation)...................1-47
Fig. 53 State transition................................................................................................................1-48
Fig. 54 Programming and testing of One Time PROM version ............................................1-53
Fig. 55 Timing chart after an interrupt occurs.........................................................................1-55
Fig. 56 Time up to execution of the interrupt processing routine ........................................1-55
Fig. 57 A-D conversion equivalent circuit.................................................................................1-57
Fig. 58 A-D conversion timing chart..........................................................................................1-57
CHAPTER 2 APPLICATION
Fig. 2.1.1 Memory map of registers relevant to I/O port .........................................................2-2
Fig. 2.1.2 Structure of Port Pi (i = 0, 2, 3)................................................................................2-3
Fig. 2.1.3 Structure of Port P1.....................................................................................................2-3
Fig. 2.1.4 Structure of Port Pi direction register (i = 0, 2, 3) .................................................2-4
Fig. 2.1.5 Structure of Port P1 direction register ......................................................................2-4
Fig. 2.1.6 Structure of Pull-up control register ..........................................................................2-5
Fig. 2.1.7 Structure of Port P1P3 control register ....................................................................2-5
Fig. 2.1.8 Structure of Interrupt edge selection register ..........................................................2-6
Fig. 2.1.9 Structure of Interrupt request register 1 ...................................................................2-6
Fig. 2.1.10 Structure of Interrupt control register 1 ..................................................................2-7
Fig. 2.1.11 Example of application circuit ..................................................................................2-7
Fig. 2.1.12 Example of control procedure (1) ............................................................................2-8
Fig. 2.1.13 Example of control procedure (2) ............................................................................2-9
Fig. 2.2.1 Memory map of registers relevant to timer A........................................................2-13
Fig. 2.2.2 Structure of Port P0 direction register ....................................................................2-14
Fig. 2.2.3 Structure of Pull-up control register ........................................................................2-14
Fig. 2.2.4 Structure of Timer A mode register.........................................................................2-15
Fig. 2.2.5 Structure of Timer A register....................................................................................2-16
Fig. 2.2.6 Structure of Interrupt edge selection register ........................................................2-16
Fig. 2.2.7 Structure of Interrupt request register 1 .................................................................2-17
Fig. 2.2.8 Structure of Interrupt request register 2 .................................................................2-17
Fig. 2.2.9 Structure of Interrupt control register 1 ..................................................................2-18
Fig. 2.2.10 Structure of Interrupt control register 2 ................................................................2-18
Fig. 2.2.11 Setting method for timer mode ..............................................................................2-20
Fig. 2.2.12 Example of control procedure ................................................................................2-21
Fig. 2.2.13 Setting method for period measurement mode (1) .............................................2-22
Fig. 2.2.14 Setting method for period measurement mode (2) .............................................2-23
Fig. 2.2.15 Example of peripheral circuit..................................................................................2-24
Fig. 2.2.16 Example of control procedure ................................................................................2-25
Fig. 2.2.17 Setting method for event counter mode (1).........................................................2-26
Fig. 2.2.18 Setting method for event counter mode (2).........................................................2-27
Fig. 2.2.19 Example of measurement method of frequency ..................................................2-28
Fig. 2.2.20 Example of control procedure ................................................................................2-29
Fig. 2.2.21 Setting method for pulse width HL continuously measurement mode (1) .......2-30
Fig. 2.2.22 Setting method for pulse width HL continuously measurement mode (2) .......2-31
Fig. 2.2.23 Example of peripheral circuit..................................................................................2-32
Fig. 2.2.24 Operation timing when ringing pulse is input ......................................................2-32
Fig. 2.2.25 Example of control procedure (1) ..........................................................................2-33
Fig. 2.2.26 Example of control procedure (2) ..........................................................................2-34
List of figures