W742C814 データシートの表示（PDF） - Winbond

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W742C814

4-BIT MICROCONTROLLER

Winbond 

W742C814

Bit 0 = 0 The internal fundamental frequency of Timer 1 is FOSC.

= 1 The internal fundamental frequency of Timer 1 is FOSC/64.

Bit 1 = 0 The fundamental frequency source of Timer 1 is the internal clock.

= 1 The fundamental frequency source of Timer 1 is the Fslow-oscillator frequency Fslow

(32768 Hz).

Bit 2 is reserved.

Bit 3 = 0 Timer 1 stops down-counting.

= 1 Timer 1 starts down-counting.

MFP control pin is organized as a 4-bit binary register.

32

BUZCR

10

W

Note: W means write only.

Bit 0 = 0 The specified waveform of the MFP generator is delivered to the MFP output pin.

= 1 The specified frequency of Timer 1 is delivered to the MFP output pin.

Bit 1, Bit 2 & Bit 3 are reserved.

6.12 Interrupts

The W742C814 provides four internal interrupt sources (Divider 0, Divider 1, Timer 0, Timer 1) and

one external interrupt source (port RC). Vector addresses for each of the interrupts are located in the

range of program memory (ROM) addresses 004H to 020H. The flags IEF, PEF, and EVF are used to

control the interrupts. When EVF is set to "1" by hardware and the corresponding bits of IEF and PEF

have been set by software, an interrupt is generated. When an interrupt occurs, all of the interrupts

are inhibited until the EN INT or MOV IEF,#I instruction is invoked. The interrupts can also be disabled

by executing the DIS INT instruction. When an interrupt is generated in hold mode, the hold mode will

be released momentarily and interrupt subroutine will be executed. After the RTN instruction is

executed in an interrupt subroutine, the µC will enter hold mode again. The operation flow chart is

shown in Figure 6-9. The control diagram is shown in Figure 6-8.

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Publication Release Date: February 12, 2003

Revision A2

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