UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 585

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) Macro service channel configuration
* Bits 20 to 23 must be set to 0.
The macro service pointer (MP) indicates the data buffer area in the 1 M-byte memory space that is the transfer
destination or transfer source.
The low-order 8 bits of the SFR that is the transfer destination or transfer source is written to the SFR pointer (SFRP).
The macro service counter (MSC) is a 16-bit counter that specifies the number of data transfers.
The macro service channel that stores the MP, SFRP and MSC is located in internal RAM space addresses 0FE00H
to 0FEFFH when the LOCATION 0 instruction is executed, or 0FFE00H to 0FFEFFH when the LOCATION 0FH
instruction is executed.
The macro service channel is indicated by the channel pointer as shown in Figure 20-26. In the channel pointer, the
low-order 8 bits of the address are written to the macro service counter in the macro service channel.
High Addresses
Low Addresses
Macro Service
Channel
Macro Service
Control Word
Macro Service
Counter (MSC)
Macro Service
Pointer (MP)
Macro service buffer address = macro service pointer
Figure 20-26 Type B Macro Service Channel
SFR Pointer (SFRP)
CHAPTER 20 INTERRUPT FUNCTIONS
Channel Pointer
Mode Register
(Bits 16 to 23)*
(Bits 8 to 15)
(Bits 8 to 15)
(Bits 0 to 7)
(Bits 0 to 7)
Buffer Area
SFR
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