NEC PD78P214 Manuale Utente

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Chapter 12   Interrupt Functions

The following example shows how data received through an asynchronous serial interface is transferred to
a buffer area in the internal RAM.

The type B macro service transfers data between a data area in the memory specified by the macro service
channel and an SFR.

For this macro service, the direction of data transfer can be specified as either “from memory to SFR” or “from
SFR to memory.”

Data transfer is repeated as many times as previously specified in the macro service counter.  The macro
service transfers 8-bit data.

The type B macro service can be specified for all interrupt requests of the 

µPD78214 that can activate a macro

service.  For the type B macro service, the SFR pointers can specify any SFRs for data transfer sources and
destinations.

This macro service is a general-purpose version of the type A macro service.  It has a data buffer area in a 64K-
byte address space and therefore is suitable for transfer of a large amount of data.

0FEC0H

0FECFH

MSC

0F

Mode register

Channel pointer

41

CF

Internal RAM

-1

Type A:  SFR

→  memory

Internal bus

Receive buffer (RXB)

Shift register

INTSR macro service request

RXB/P30