Freescale Semiconductor MC68HC08KH12 Manual do Utilizador Página 237
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MC68HC(7)08KH12 — Rev. 1.1 Advance Information
Freescale Semiconductor
237
4. Write to the ACKF bit in the keyboard status and control register
to clear any false interrupts.
5. Clear the IMASKF bit.
An interrupt signal on an edge-triggered pin can be acknowledged
immediately after enabling the pin. An interrupt signal on an edge- and
level-triggered interrupt pin must be acknowledged after a delay that
depends on the external load.
15.6.3 Port-F Keyboard Interrupt Registers
15.6.3.1 Port-F Keyboard Status and Control Register
• Flags keyboard interrupt requests.
• Acknowledges keyboard interrupt requests.
• Masks keyboard interrupt requests.
• Controls keyboard interrupt triggering sensitivity.
Bits [7:4] — Not used
These read-only bits always read as logic 0s.
KEYFF — Port-F Keyboard Flag Bit
This read-only bit is set when a keyboard interrupt is pending on
port-F. Reset clears the KEYFF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
Address: $0040
Bit 7654321Bit 0
Read: 0000KEYFF 0
IMASKF MODEF
Write:
ACKF
Reset:00000000
= Unimplemented
Figure 15-8. Port-F Keyboard Status and Control Register (KBFSCR)
- MC68HC08KH12 1
- Data Sheet 1
- List of Sections 3
- 4 Freescale Semiconductor 4
- Table of Contents 5
- Section 10. Monitor ROM (MON) 10
- Section 12. I/O Ports 11
- 16 Freescale Semiconductor 16
- List of Figures 17
- List of Tables 21
- 1.1 Contents 23
- 1.2 Introduction 24
- 1.3 Features 24
- 1.4 MCU Block Diagram 26
- Figure 1-1. MCU Block Diagram 27
- 68HC(7)08KH12 28
- Section 2. Memory Map 33
- 34 Freescale Semiconductor 34
- Figure 2-1. Memory Map 34
- 2.3 I/O Section 35
- 36 Freescale Semiconductor 36
- 38 Freescale Semiconductor 38
- 40 Freescale Semiconductor 40
- 42 Freescale Semiconductor 42
- 2.4 Monitor ROM 43
- 44 Freescale Semiconductor 44
- 3.1 Contents 45
- 3.2 Introduction 45
- 3.3 Functional Description 45
- 4.1 Contents 47
- 4.2 Introduction 47
- 4.3 Functional Description 47
- 48 Freescale Semiconductor 48
- 5.1 Contents 49
- 5.2 Introduction 49
- 5.3 Functional Description 49
- 6.1 Contents 51
- 6.2 Introduction 51
- 6.3 Features 52
- 6.4 CPU Registers 52
- V11HINZC 57
- 60 Freescale Semiconductor 60
- 7.1 Contents 61
- 7.2 Introduction 62
- Figure 7-1. SIM Block Diagram 63
- 64 Freescale Semiconductor 64
- POR 4163 (4096 + 64 + 3) 67
- All others 67 (64 + 3) 67
- 7.5 SIM Counter 71
- 7.6 Exception Control 72
- . Interrupt Entry 74
- (2) 0= highest priority 77
- 7.7 Low-Power Modes 79
- 7.8 SIM Registers 83
- 8.1 Contents 87
- 8.2 Introduction 88
- 8.3 Features 89
- 8.4 Functional Description 89
- 90 Freescale Semiconductor 90
- Figure 8-1. CGM Block Diagram 90
- 8.5 I/O Signals 98
- 8.6 CGM Registers 100
- — Rev. 1.1 102
- Freescale Semiconductor 103
- 8.7 Interrupts 107
- 8.8 Special Modes 107
- 9.1 Contents 113
- 9.2 Features 114
- 9.3 Overview 115
- 118 Freescale Semiconductor 118
- 136 Freescale Semiconductor 136
- 10.1 Contents 149
- 10.2 Introduction 149
- 10.3 Features 150
- 10.4 Functional Description 150
- 156 Freescale Semiconductor 156
- 158 Freescale Semiconductor 158
- 160 Freescale Semiconductor 160
- 11.1 Contents 161
- 11.2 Introduction 162
- 11.3 Features 162
- 11.4 Functional Description 163
- 164 Freescale Semiconductor 164
- 11.5 Interrupts 171
- 11.6 Wait Mode 171
- 11.8 I/O Signals 172
- 11.9 I/O Registers 173
- 182 Freescale Semiconductor 182
- Section 12. I/O Ports 183
- 12.2 Introduction 184
- 12.3 Port A 186
- 12.4 Port B 188
- 12.5 Port C 190
- 12.6 Port D 192
- 12.7 Port E 195
- 1. X = don’t care 198
- 2. Hi-Z = high impedance 198
- 200 Freescale Semiconductor 200
- 12.8 Port F 202
- 12.9 Port Options 204
- 206 Freescale Semiconductor 206
- 13.1 Contents 207
- 13.2 Introduction 207
- 13.3 Functional Description 208
- 13.4 I/O Signals 209
- 13.6 Interrupts 211
- 13.7 Monitor Mode 211
- 13.8 Low-Power Modes 212
- 14.1 Contents 213
- 14.2 Introduction 213
- 14.3 Features 213
- 14.4 Functional Description 214
- INTERNAL 215
- 15.1 Contents 219
- 15.2 Introduction 220
- 15.3 Features 220
- 222 Freescale Semiconductor 222
- 228 Freescale Semiconductor 228
- 234 Freescale Semiconductor 234
- 15.7 Wait Mode 239
- 15.8 Stop Mode 239
- 16.1 Contents 241
- 16.2 Introduction 241
- 16.3 Features 242
- 16.4 Functional Description 242
- 16.5 Break Module Registers 244
- 16.6 Low-Power Modes 246
- 17.1 Contents 247
- 17.2 Introduction 247
- 1. Voltages referenced to V 248
- 17.5 Thermal Characteristics 249
- 250 Freescale Semiconductor 250
- 17.7 Control Timing 251
- 252 Freescale Semiconductor 252
- 254 Freescale Semiconductor 254
- 17.13 USB Signaling Levels 256
- 258 Freescale Semiconductor 258
- 18.1 Contents 259
- 18.2 Introduction 259
- 260 Freescale Semiconductor 260
- How to Reach Us: 262
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