CHAPTER 3 CPU FUNCTION
User’s Manual U12688EJ4V0UM00
74
3.3
Operation Modes
3.3.1 Operation modes
The V850E/MS1 has the following operation modes. Mode specification is carried out by MODE0 to MODE3.
(1) Normal operation mode
(a) Single-chip modes 0, 1
Access to the internal ROM is enabled.
In single-chip mode 0, after system reset is cancelled, each pin related to the bus interface enters the port
mode, branches to the reset entry address of the internal ROM and starts instruction processing. The
external expansion mode, which connects an external device to external memory area, is enabled by
setting the memory expansion mode register (MM: refer to 3.4.6 (1)) with an instruction.
In single-chip mode 1, after system reset is cancelled, each pin related to the bus interface enters the
control mode, branches to the external device (memory) reset entry address and starts instruction
processing.
The internal ROM area is mapped from address 100000H.
(b) ROM-less modes 0, 1
After system reset is cancelled, each pin related to the bus interface enters the control mode, branches to
the external device (memory) reset entry address and starts instruction processing. Fetching of
instructions and data access from internal ROM becomes impossible.
In ROM-less mode 0, the data bus is a 16-bit data bus and in ROM-less mode 1, the data bus is an 8-bit
data bus.
(2) Flash memory programming mode (
µµµµ
PD70F3102 and 70F3102A only)
If this mode is specified, it becomes possible for the flash programmer to run a program to the internal flash
memory.
Содержание V850E/MS1 UPD703100
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