HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 537
HD6432160
Manufacturer Part Number
HD6432160
Description
Hitachi 16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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Table 18.6 Fast A20 Gate Output Signal
Notes: 1. Arbitrary data with bit 1 set to 1.
18.4.4
Host interface output can be placed in the high-impedance state according to the state of the
HIFSD pin. Setting the SDE bit to 1 in the SYSCR2 register when the HI12E bit is set to 1 enables
the HIFSD pin. The HIF constantly monitors the HIFSD pin, and when this pin goes low, places
the host interface output pins (HIRQ1, HIRQ11, HIRQ12, HIRQ3, HIRQ4, and GA20) in the
high-impedance state. At the same time, the host interface input pins (&64, &65 or (&65, &66,
&67, ,2:, ,25, and HA0) are disabled (fixed at the high input state internally) regardless of the
pin states, and the signals of the multiplexed functions of these pins (input block) are similarly
fixed internally. As a result, the host interface I/O pins (HDB7 to HDB0) also go to the high-
impedance state.
This state is maintained while the HIFSD pin is low, and when the HIFSD pin returns to the high-
level state, the pins are restored to their normal operation as host interface pins.
HA0
1
0
1
1
0
1
1
0
1/0
1
0
1/0
1
1
1
1
1
0
1
2. Arbitrary data with bit 1 cleared to 0.
Data/Command
H'D1 command
1 data*
H'FF command
H'D1 command
0 data*
H'FF command
H'D1 command
1 data*
Command other than H'FF
and H'D1
H'D1 command
0 data*
Command other than H'FF
and H'D1
H'D1 command
Command other than H'D1
H'D1 command
H'D1 command
H'D1 command
Any data
H'D1 command
Host Interface Pin Shutdown Function
1
2
1
2
Internal CPU
Interrupt Flag
(IBF)
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
0
0
0
GA20
(P81)
Q
1
Q (1)
Q
0
Q (0)
Q
1
Q (1)
Q
0
Q (0)
Q
Q
Q
Q
Q
1/0
Q (1/0)
Rev. 2.0, 08/02, page 497 of 788
Remarks
Turn-on sequence
Turn-off sequence
Turn-on sequence
(abbreviated form)
Turn-off sequence
(abbreviated form)
Cancelled sequence
Retriggered sequence
Consecutively executed
sequences
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