UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 5

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

1.
2.
3.
4.
5.
PIN FUNCTIONS ........................................................................................................................
1.1
1.2
1.3
1.4
ARCHITECTURE AND MEMORY MAP OF THE PD75238 ...................................................
2.1
2.2
2.3
INTERNAL CPU FUNCTIONS ....................................................................................................
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
PERIPHERAL HARDWARE FUNCTIONS ..................................................................................
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
INTERRUPT FUNCTION ............................................................................................................ 131
5.1
5.2
5.3
5.4
5.5
PORT PINS ......................................................................................................................................
NON-PORT PINS ............................................................................................................................
PIN INPUT/OUTPUT CIRCUITS ....................................................................................................
CONNECTION OF UNUSED PD75238 PINS ..............................................................................
DATA MEMORY BANK CONFIGURATION AND ADDRESSING MODES ................................
GENERAL REGISTER BANK CONFIGURATION ..........................................................................
MEMORY-MAPPED I/O .................................................................................................................
PROGRAM COUNTER (PC) ...........................................................................................................
PROGRAM MEMORY (ROM) ........................................................................................................
DATA MEMORY (RAM) .................................................................................................................
GENERAL REGISTERS ...................................................................................................................
ACCUMULATORS ..........................................................................................................................
STACK POINTER (SP) AND STACK BANK SELECT REGISTER (SBS) .....................................
PROGRAM STATUS WORD (PSW) ..............................................................................................
BANK SELECT REGISTER (BS) .....................................................................................................
DIGITAL I/O PORTS .......................................................................................................................
CLOCK GENERATOR ......................................................................................................................
CLOCK OUTPUT CIRCUIT .............................................................................................................
BASIC INTERVAL TIMER ...............................................................................................................
TIMER/EVENT COUNTER .............................................................................................................
CLOCK TIMER .................................................................................................................................
TIMER/PULSE GENERATOR .........................................................................................................
EVENT COUNTER ..........................................................................................................................
SERIAL INTERFACE .......................................................................................................................
A/D CONVERTER ........................................................................................................................... 113
BIT SEQUENTIAL BUFFER ............................................................................................................ 119
FIP CONTROLLER/DRIVER ............................................................................................................ 119
CONFIGURATION OF THE INTERRUPT CONTROL CIRCUIT .................................................... 131
HARDWARE OF THE INTERRUPT CONTROL CIRCUIT .............................................................. 133
INTERRUPT SEQUENCE ................................................................................................................ 138
MULTIPLE INTERRUPT PROCESSING CONTROL ...................................................................... 139
VECTOR ADDRESS SHARE INTERRUPT PROCESSING ............................................................ 141
CONTENTS
PD75238
16
27
40
11
15
16
19
22
27
27
29
31
32
32
35
39
40
49
58
61
63
69
71
77
79
7
7
9
5