upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 90
upd70f3017ay
Manufacturer Part Number
upd70f3017ay
Description
V850/sa1tm 32-/16-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD70F3017AY.pdf
(492 pages)
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4.2.2 Control register
(1) System control register (SYC)
After reset: 00H
4.3 Bus Access
4.3.1 Number of access clocks
90
Symbol
Instruction fetch
Operand data access
SYC
The number of basic clocks necessary for accessing each resource is as follows.
Remarks 1. Unit: Clock/access
This register switches the control signals for bus interface.
The system control register can be read/written in 8-bit or 1-bit units.
Bus Cycle Type
Note The UBEN signal is output regardless of the BIC bit setting in the external expansion mode (set by the
Caution When using port 9 as an I/O port, be sure to set the BIC bit to 0.
BIC
2. n: Number of waits inserted
7
0
0
1
memory expansion mode register (MM)).
R/W
DSTB, R/W, LBEN, UBEN signal output
RD, WRL, WRH, UBEN
6
0
Internal ROM
(32 Bits)
CHAPTER 4 BUS CONTROL FUNCTION
5
0
1
3
Table 4-2. Number of Access Clocks
Note
User’s Manual U12768EJ4V1UD
signal output
Address: FFFFF064H
4
0
Bus Interface Control
Internal RAM
(32 Bits)
3
0
3
1
Peripheral I/O (Bus Width)
2
0
Peripheral I/O
Disabled
(16 Bits)
1
0
3
BIC
0
External Memory
(16 Bits)
3 + n
3 + n
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