Status Register (Sr) - Hitachi HD64465 User Manual

Control Register (CR) [cont'd]
Bit Description
4 KCRESUME Trigger Type Select 0 (KCRTTS0):
1: edge trigger is selected.
0: level trigger is selected.
3 IRQ1 Trigger Type Select 1 (IRQ1TTS1):
1: If edge trigger is selected, falling edge trigger is selected.
If level trigger is selected, low level trigger is selected.
0: If edge trigger is selected, rising edge trigger is selected.
If level trigger is selected, high level trigger is selected.
2 IRQ1 Trigger Type Select 0 (IRQ1TTS0):
1: edge trigger is selected
0: level trigger is selected
1 IRQ0 Trigger Type Select 1(IRQ0TTS1):
1: If edge trigger is selected, falling edge trigger is selected.
If level trigger is selected, low level trigger is selected.
0: If edge trigger is selected, rising edge trigger is selected.
If level trigger is selected, high level trigger is selected.
0 IRQ0 Trigger Type Select 0(IRQ0TTS0):
1: edge trigger is selected
0: level trigger is selected
16.2.2

Status Register (SR)

SR, an 8-bit Read Only register, is used to reflect the status of keyboard controller interface. All
bits in this register are initialized to 0 at reset. SR is not initialized in STANDBY mode.
Bit 7
Bit Name reserved reserved reserved reserved reserved KCR
Initial Value -
R/W -
Bit Description
7 - 3 Reserved
2 Keyboard Controller Resume (KCR): 1 indicates that the Keyboard Controller signals
resume. Write 1 to clear this bit.
1 Keyboard Controller Interrupt Request 1 (KCIRQ1): 1 indicates that the Keyboard
Controller signals IRQ1. Write 1 to clear this bit.
0 Keyboard Controller Interrupt Request 0 (KCIRQ0): 1 indicates that the Keyboard
Controller signals IRQ0. Write 1 to clear this bit.
Rev. 3.0, 03/01, page 246 of 390
6 5 4
- - -
- - -
3 2 1
KCIRQ1 KCIRQ0
- 0 0
- R R
Default
0
0
0
0
0
0
0
R
Default
-
0
0
0