UPD784938 Datasheet, PDF (568/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 23 INTERRUPT FUNCTIONS
Figure 23-21. Macro Service Mode Register Format (2/2)
7
6
5
4
3
2
1
0
VCIE MOD2 MOD1 MOD0 CHT3 CHT2 CHT1 CHT0
CHT0
0
1
0
1
CHT1
0
0
1
1
CHT2
1
1
1
1
CHT3
1
1
1
1
MOD2 MOD1 MOD0
Type C
Decrements MPD
Increments MPD
Retains MPT Decrements MPT Retains MPT Increments MPT
0
0
0 Data size for timer No automatic No ring control
specified
addition
0
0
1 _{by MPT: 1 byte}
Ring control
0
1
0
0
1
1
Automatic
addition
No ring control
Ring control
1
0
0 Data size for timer No automatic No ring control
specified
addition
1
0
1 _{by MPT: 2 bytes}
Ring control
1
1
0
1
1
1
Automatic
addition
No ring control
Ring control
VCIE
0
1
Interrupt Request when MSC = 0
Generated
Not generated (next interrupt processing is vectored interrupt)
(3) Macro service channel pointer
The macro service channel pointer specifies the macro service channel address. The macro service channel can be
located in the 256-byte space from FE00H to FEFFH when the LOCATION 0 instruction is executed, or FFE00H to
FFEFFH when the LOCATION 0FH instruction is executed, and the high-order 16 bits of the address are fixed.
Therefore, the low-order 8 bits of the data stored to the highest address of the macro service channel are set in the
macro service channel pointer.
568
Preliminary User’s Manual U13987EJ1V0UM00